hus vm architecture

7232019 HUS VM Architecture

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Hitachi Unified Storage VM Architecture Guide

By Hitachi Data Systems

December 2012



ARCHITECTURE GUIDE 2

Contents

Executive Summary 3

Chapter 1 Unifed Storage with Enterprise Virtualization 4

A Single Virtualized Platform with Hitachi Unified Storage VM 4

Chapter 2 Hitachi Unified Storage VM Architecture 4

One Platform for All Data 5

Hitachi Unifed Storage VM Hardware Components 5

High-Performance Switched Network 11

Cache and Control Memory 12

Front-End Design 12

High-Performance SAS Back-End Design 13

Chapter 3 Software Packages 17

Block Module Software Bundles 17

File Module Software Bundles 24

Conclusion A Single Virtualized Platform for all Data 26





Executive SummaryHitachi Unified Storage VM (HUS VM) is a storage platform for small to medium enterprises that combines storage

virtualization services with unified block file and object data management (see Figure 1 ) This versatile scalable plat-

form provides a new storage virtualization system with central storage services for existing storage assets Unified

management delivers end-to-end central storage management of all virtualized internal and external storage A

unique hardware-accelerated object-based file system supports intelligent file tiering and migration as well as virtual

NAS functionality without compromising performance or scalability

This storage platform requires less floor space and cooling due to innovative new technologies and packaging It

offers tighter integration with server virtualization and improved storage administrator productivity through Hitachi

Command Suite Hitachi Command Suite is an open standards-based suite of tools that provides comprehensive

management control and reporting for all file object and block services This software suite enables single-pane-of-

glass management of all virtualized internal and external storage attached to HUS VM

Using this system you can deploy virtual server applications within a new storage virtualization framework You

can extend new services to your current storage investments and more closely align IT with business objectives by

enhancing capacity efficiency HUS VM storage systems provide the foundation for matching application service

requirements to different classes of storage and for delivering critical services

Figure 1 Hitachi Unified Storage VM




Chapter 1 Unified Storage with Enterprise Virtualization

To achieve growth and efficiency businesses today must overcome a range of challenges while faced with surg-

ing operating expenses and flat budgets Building an enterprise-level storage infrastructure should not be one of

their challenges Hitachi Unified Storage VM (HUS VM) changes the storage economics equation by introducing the

worldrsquos first unified storage platform with enterprise storage virtualization With storage virtualization businesses gain

higher value and higher functionality resulting in greater capacity efficiency and extensive cost savings

A Single Virtualized Platform with Hitachi Unified Storage VM

Hitachi Data Systems offers a unique approach to storage management a single virtualized platform for all data

(structured and unstructured) with single-pane-of-glass management for heterogeneous environments (see Figure 2 )

We are focused on the evolving requirements of structured and unstructured data And we are the only vendor who

can provide you with a single virtualized and scalable data management architecture for all open systems platforms

as well as all data and information types

Figure 2 Hitachi Consolidated Storage Virtualization

Hitachi Unified Storage VM enables a common set of management tools across all storage assets whether they are

the products of Hitachi Data Systems or our competitors Our common platform and management tools improve the

productivity of storage administrators and enable better cost management (power cooling resource sharing) simpli-

fied data migration (block and file storage) and higher availability (IOPS and reliability) with less risk (data protection)

Chapter 2 Hitachi Unified Storage VM Architecture

Like Hitachi Virtual Storage Platform (VSP) which we introduced in 2010 Hitachi Unified Storage VM is based on

the Hi-Star crossbar-switch architecture This architecture provides a shared resource system where all the primary

components including front-end ports back-end ports cache modules and processors are connected through an

internal switched network HUS VM supports up to 64PB of internal and external virtualized storage capacity and up

to 256GB of directly addressable cache (see Table 1 )




The internal processors share a global cache along with the front-end and back-end IO modules which creates a

common pool of storage resources and disk capacity This disk capacity can include external storage which is con-

nected through host-initiator Fibre Channel ports

One Platform for All Data

Controller-based storage virtualization is a key enabling technology to providing one platform for all data In addition

the internal architecture of Hitachi Unified Storage VM separates management and control processing from front-end

and back-end processing It delivers improved performance for any unique processing required by different types

of data It also provides the flexibility to mix and match front-end and back-end storage services to rapidly achieve

a desired goal Consolidated and aggregated multivendor storage resources provide a single platform of enterprise

capacity for all file object and block services functionality

Operational Simplicity

Hitachi controller-based storage virtualization dramatically simplifies the storage infrastructure Virtualization enables

the consolidation and aggregation of all multivendor storage resources in a single pool of enterprise storage capac-

ity Existing LUNs and data on externally attached storage systems are automatically discovered by Hitachi Universal

Volume Manager The LUNs and data are presented through global cache as if they were still connected to the appli-cation server

Hitachi Command Suite offers a comprehensive set of management control and discovery tools for file object and

block storage services The software integrates solutions for storage resource management tiered storage business

continuity and thin provisioning giving storage managers a unified management solution for all enterprise storage

Hitachi Unified Storage VM Hardware Components

Hitachi Unified Storage VM can be configured starting with a single diskless system up to a full 3-rack system (see

Table 1 ) The full system can include up to 1152 hard disk drives (HDDs) up to 128 solid-state drives (SSDs) and a

total of 256GB cache The system provides a highly granular upgrade path allowing the addition of file modules or

disk drives to the drive chassis in an existing system as storage needs increase All modules or drives are mounted in

standard 19-inch racks A basic HUS VM storage system consists of a 5U controller chassis and none or 1 or moredrive trays that contain the HDDs or SSDs HUS VM supports multiple concurrent operating systems to create a het-

erogeneous system environment

The controller chassis has dual controllers and each controller has a cache blade and a processor blade All data

passes through the cache blade application-specific integrated circuit (ASIC) to cache The processor blade executes

all IO jobs and manages cache HUS VM hardware is composed of the following major components as shown in

Figure 3

Block modules mdash storage virtualization system with support for internal and external virtualized storage

File modules mdash file virtualization system with support for internal and external virtualized storage

Drive trays mdash support for large form factor (LFF) 35-inch drives and small form factor (SFF) drives

Rack mdash Hitachi Data Systems or standard 19-inch rack using our supplied rail kits




Figure 3 Hitachi Unified Storage VM Components

Block Module

Hitachi Unified Storage VM is based on a new block storage system powered by a storage virtualization control-ler This virtual storage system is a single controller chassis available without drives It contains the control logic

processors memory and interfaces to the drive chassis and the host servers (see Figures 4 and 5) Its dual-node

shared-resource architecture creates a redundant configuration in which the storage system can continue operation

should a component failure occur

The block module enables virtualized data access by aggregating storage servers with enterprise storage services

without added complexity It provides common enterprise storage and data services for lower-level lower-cost stor-

age by leveraging existing investments and it provides seamless integration for future capabilities

Main components can be added removed and replaced in the block module without shutting down a device while

the storage system is in operation The microcode can also be upgraded without shutting down the storage system

An integrated service processor mounted in the controller chassis monitors the running condition of the storage

system Connecting the service processor with our service center enables remote maintenance As shown in Figure

5 the block module features

Up to 32 x 8GB Fibre Channel (48 without drives)

4 x 8 WL 6GB SAS

Integrated switching power supplies

Integrated service processor




Figure 4 Controller Chassis

Figure 5 Block Module Chassis Rear Detail




The block controller module includes 2 cache blades 2 processor blades an integrated service processor and dual

power supplies with built-in cooling fans Each cache blade has slots for the system cache Each also contains an

ASIC that includes most of the discrete logic previously found on Virtual Storage Platform front-end director and

back-end director boards and a battery for data saving If a power failure continues more than 20 milliseconds thestorage system uses power from the batteries to back up the cache memory data and the storage system configura-

tion data onto the cache flash memory

The processor blade contains an Intel Xeon 8-core processor and local RAM

A basic HUS VM chassis with dual controllers provides a total of

2 cache blades each with

Up to 128GB of cache (16 x 8GB DDR3 DIMMs)

160GB flash for cache backup (2 x 80GB)

Flash battery

2 processor blades each with

1 x 8-core Intel Xeon processor

8GB of local memory (2 x 4GB DIMMs)

8 host modules (4 x 8Gbsec Fibre Channel ports each)

4 drive modules (8 x 6Gbsec SAS links each)

Supports up to 1152 HDDs housed in the disk trays

File Module

Hitachi Unified Storage VM file module features a hybrid core architecture that uses the best properties ofFPGA-based design to optimize data movement These properties are coupled with high-performance multicore pro-

cessors for efficient data management Both classes of activity work at full speed without impacting each other They

can handle a number of simultaneous workloads and responsibilities such as serving email to thousands of users

and hosting large-scale online transaction processing (OLTP) applications while maintaining high performance

The file module provides virtualized file access through a single cluster namespace unifying the directory structure

and presenting a single logical view (see Figure 6 ) It provides a virtual NAS to allocate server resources for perfor-

mance and high availability and storage pools that simplify storage provisioning for applications and workgroups

Tiered storage optimizes performance high availability and disk utilization across multiple tiers of storage

The file module provides high IOPS performance utilizing built-in 10 gigabit Ethernet (GbE) and 1GbE for high

throughput NAS and iSCSI networking connectivity Up to 4 nodes in a single cluster will meet demands for scalable

storage with greater access capacity and performance Storage can be added at any time to meet new application

or business needs or to consolidate disparate storage with a single point of management and without downtime

These systems offer a total usable capacity from 4PB to 8PB under a single namespace with easy-to-use centralized

system management that enables administration via command-line interface (CLI) or an intuitive graphical user inter-

face (GUI)




Figure 6 File Module Rear Detail

HUS VM file modules are designed to meet the high performance and scalability requirements of enterprise mission-

critical applications They can help reduce total cost of ownership (TCO) through consolidation without sacrificing

performance and scalability We employ BlueArcreg1 Silicon FS a patented hardware-accelerated object-based file

system to enable file system performance and scalability without compromise In addition multiple layers of storage

virtualization overcome the complexities associated with large-scale file system management and data availability

Metadata optimization for improved storage efficiency is included in BlueArc Silicon FS The number of metadata

operations is significantly greater than the regular data operations and contributes to a larger share of the IO work-

load mix This function enables use of fewer high-performance disks combined with lower cost disks while achieving

the same high performance This efficiency derives from the automatic separation of metadata from user data

Metadata is placed on the faster tier of utilized storage and the user data on the slower less expensive tier This

results in improved overall system performance and reduced costs

The BlueArc Silicon FS also includes core functionality for storage virtualization Individual file systems belong to

enterprise virtual servers (EVS) within each physical system each with its own set of IP addresses policies and

individual port assignments Virtual servers are used to group server resources to match the needs of application or

organizational requirements In a clustered environment file systems can be quickly relocated among physical servers

for load balancing and virtual servers automatically migrate in a cluster failover scenario

The file system also organizes RAID storage into a logical pool of shared storage that can simultaneously provi-

sion multiple file systems This allows administrators to provision file systems as needed manually or by setting rules

that automatically enforce policies distributing data dynamically across available storage to optimize performanceIntelligent file tiering helps organizations move data among storage and archive tiers whether internally to the data

center or externally from remote or branch offices with automated policy-driven migration tools

The cluster namespace functionality provides a single namespace with a directory structure that is independent of

where data actually resides in physical storage Virtual servers are used to group server resources to match the needs

of application or organizational requirements In a clustered environment file systems can be quickly relocated among

physical servers for load balancing and virtual servers automatically migrate in a cluster failover scenario

1 BlueArc is now a part of Hitachi Data Systems




Drive Trays

Hitachi Unified Storage VM is available with a choice of disk drives ranging from high-performance SSDs to SAS

drives Both LFF 35-inch drives and SFF 25-inch drives are supported All drive types use a 6Gbsec SAS interface

The standard drive tray (see Figure 7 ) is a chassis that enables the installation of up to twenty-four 25-inch SFF disk

drives and 25-inch flash drives It includes 2 enclosure communication cards and 2 power supplies with a built-in

cooling fan

Figure 7 Drive Tray 25-inch SFF and 35-inch LFF

The dense disk drive is configured with up to forty-eight 35-inch LFF drives (see Figure 8 ) The enclosure communi-

cation cards and power supplies are individual for each half of the unit and are installed as a duplex configuration

Figure 8 Drive Tray 35-inch LFF DBX Dense




TABLE 1 HITACHI UNIFIED STORAGE VM SPECIFICATIONS

Physical Characteristics

Maximum Standard Disk Expansion Trays (2U 24 x 25rdquo disks) 48


Maximum Dense Expansion Trays (4U 48 x 35rdquo disks) 24

Data Cache (GB) 64-256

Fibre Channel Port Performance (Gbsec) 248

Maximum Logical Devices (LDEVs) 16384

Number of Disks per System (with spares) (25rdquo or 35rdquo) 0-1152

Number of Flash Drives per System (SSD) 0-128

Number of Disk Spares 1-64

Maximum Internal and External Capacity (PB) 64PB

Block Modules

Architecture Hierarchical star network

Backend SAS links (6Gbsec) 2-4 2-port modules (32 SAS links 4 WL links per port)

Dimensions HxWxD 5U 85 (217mm) x 190 (480mm) x 33 (838mm)

Weight 156 lbs (71kg)

File Modules

Nodes per Cluster 1-4

Main Board Memory 32GB (2GB NVRAM)

Number of VLANs 256

1Gbsec Client Ports 6


Protocols SMB NFS FTP

Dimensions HeightWidthDepth 3U 51 (130mm) x 172 (437mm) x 27 (685mm)


High-Performance Switched Network

At the heart of Hitachi Unified Storage VM is the switched network that is used to communicate and transfer informa-

tion between the various components (see Figure 9 )

Each block module contains dual Hi-Star crossbar-switch controllers All cache data and control data paths are part

of the switched network This switched network is used to communicate and transfer information between the vari-

ous components of Hitachi Unified Storage VM




Figure 9 Hitachi Unified Storage VM With Hi-Star Crossbar-Switch Architecture for High-Performance Data Movement

Cache and Control Memory

Hitachi Unified Storage VM uses partitioned cache rather than a shared global cache A portion of this cache space

(4GB to 20GB per blade mirrored) is reserved for the control memory region There is also a transfer buffer region

where the host ports and drive ports transfer data blocks There is also space for 2 or 4 user data cache directories

(500MB each)

The control memory and cache directory regions are backed up to each cache bladersquos SSD on a planned shutdown

On power loss all of cache per blade is backed up to its local SSD on power loss

The remaining cache space is managed as a global pool This space is evenly divided into 4 partitions for the 4

microprocessor units A microprocessor unit may borrow some space from another partition under certain circum-

stances A microprocessor unit cannot access its own data partition only the cache blades can do so with DMA

transfers but the microprocessors manage their partitions Each processor blade microprocessor unit uses DMA to

access control memory and the cache directories on the cache blades but the cache blades do not

Front-End Design

Each host IO module contains one 4-port Tachyon QE8 8Gbsec Fibre Channel controller Each module is con-

nected to one PCIe x8 link on the ASIC on the cache blade Hitachi Unified Storage VM supports Fibre Channel for

open systems and SAN connectivity HUS VM supports up to 32 Fibre Channel ports from up to 8 host IO modules

per controller chassis Additional ports up to 48 can be added by replacing 1 to 4 drive modules per controller




chassis with host IO modules The Fibre Channel ports support industry-standard 2Gbsec 4Gbsec and 8Gbsec

transfer rates

Unique port virtualization technology dramatically expands connectivity from open systems platforms to Hitachi

Unified Storage VM Each physical Fibre Channel port supports 1024 virtual ports Each virtual port has access to a

private storage partition called a host storage domain which includes a bootable LUN0

Connectivity from all major open systems hosts is supported including2

HP HP-UX

IBMreg AIX reg

Microsoftreg Windows Serverreg (2000 2003 2008 2012)

Novell NetWare SUSE Linux Enterprise Server

Red Hat Enterprise Linux

Oracle Sun Solaris

VMware ESX Server

High-Performance SAS Back-End Design

The back end of Hitachi Unified Storage VM is a SAS engine that is a cross between the HUS 100 family and Hitachi

Virtual Storage Platform The SAS engine elements include the drive IO modules up to 48 disk trays with their dual

4-link SAS switches (ENCs) and the SAS drives The cache blade controls all communications between the drive

modules and the processor blades and all DMA transfers to cache Each drive module is connected to 1 PCIe x 8 link

on the ASIC in the main blade Each drive IO module contains 1 SAS controller device with a pair of 4-wide ports (4

x SAS 6Gbsec lanes)

HUS VM is available with a choice of disk drives ranging from high-performance SSDs to SAS drives (see Table 2 )Both LFF 35-inch drives and SFF drives are supported All drives types use a 6Gbsec interface to the back-end

directors

TABLE 2 HITACHI UNIFIED STORAGE VM DRIVE TYPES

Drive Type Size CapacitySpeed

(RPM)

SSD 25rdquo 400GB na

SAS

25rdquo 300GB 15K

25rdquo 600GB 10K

25rdquo 900GB 10K

35rdquo 3TB 72K

2 For the most updated list of supported operating systems refer to Hitachi Data Systems website at httpwwwhdscomproductsstorage-systemsspecifications

operating-system-support-vmhtml




RAID Implementation Advantages

Hitachi Data Systems drive IO modules employ advanced algorithms to manage performance The intelligent

controllers provide disk-interface and RAID management circuitry offloading these tasks to dedicated embedded

processors Hitachi Unified Storage VM supports RAID-1+0 RAID-5 (parity RAID) and RAID-6 (see Table 3 ) All user

data disks in the system are defined as part of a RAID array group of one type or another

TABLE 3 HITACHI UNIFIED STORAGE VM BACK983085END DIRECTOR SUPPORT OF RAID CONFIGURATIONS3

RAID Type Supported Disk Configuration

RAID-1+0 Mirroring 2D+2D

RAID-5 Distributed Parity3D+1P

7D+1P

RAID-6 Redundant Distributed Parity6D+2P

14D+2P

RAID-1+0

RAID-1+0 is available in 2 data plus 2 data (2D+2D) disk configuration The configuration includes a rotating copy

where the primary and secondary stripes are toggled back and forth across the physical disk drives for performance

RAID-1+0 is best suited to applications with low cache-hit ratios such as random IO activity and with high write to

read ratios

RAID-5 Distributed Parity

RAID-5 disk arrangements consist of 4 disks (3D+1P) or 8 disks (7D+1P) Data is striped across disks similar toRAID-1+0 However RAID-5 keeps parity information on each stripe of data for fault resilience If a failure occurs the

contents of the failed block can be recreated by reading back other blocks in the stripe and the parity Parity informa-

tion is distributed throughout the array to minimize bottlenecks when rebuilding data from a failed disk The overhead

of RAID-5 is equivalent to 1 disk drive regardless of the size of the array RAID-5 is best suited to applications using

mostly sequential reads

Concatenated RAID-5 Array Groups

Concatenated array groups enable users to stripe logical devices (LDEVs) across more disks than are in a single

RAID-5 array group for better performance The feature supports the concatenation of 2 or 4 RAID-5 7D+1P array

groups An LDEV created on a standard RAID-5 array group becomes a LUN when it is mapped to a host port For

concatenated array groups the LDEV striped across multiple elements in the joined array groups forms a virtual

device (VDEV) Mapping the VDEV to a host port creates the LUN

RAID-6 Redundant Distributed Parity

Like RAID-5 RAID-6 stripes blocks of data and parity across an array of drives However RAID-6 maintains redun-

dant parity information for each stripe of data This redundancy enables RAID-6 to recover from the failure of up

to 2 drives in an array (a double fault) Other RAID configurations can only tolerate a single fault As with RAID-5

3 When using Open V-volumes for RAID-5 RAID-6 or RAID-1+0 configurations Hitachi Unified Storage VM uses 2 adjacent 256KB chunks from the same disk before

moving to the next disk so the effective chunk size is 512KB For example in a RAID-5 7d + 1P configuration the stripes are actually 3584KB (7 x 512KB)




performance is adjusted by varying stripe sizes RAID-6 is good for applications using the largest disks and perform-

ing many sequential reads

RAID Rebuild

If a disk in a RAID group fails the information on the failed drive is rapidly and automatically rebuilt on a hot spare

drive Hitachi Unified Storage VM also allows logical volumes to be expanded online Administrators can set rebuild

priority based on the daily processing cycle and RAID configuration installed

Connecting External Storage

One of the most significant features offered by Hitachi Unified Storage VM is the ability to connect external multi-

vendor storage This creates a single virtualized pool of capacity for administrators to centrally manage using Hitachi

storage management software (see Figure 10 ) HUS VM supports a wide range of 3rd-party storage systems

Figure 10 A Single Virtualized Pool of Capacity

For the latest information see the Externally Attached Storage Systems for each enterprise array including the HUS

VM at wwwhdscomproductsstorage-systemsspecificationssupported-external-storagehtml

Power Subsystem

The power subsystem used in Hitachi Unified Storage VM has redundant power supplies in the controller The power

supplies are hot-pluggable hot-swappable and N+1 redundant This means power supplies can be removed or

installed without affecting system operation

Each controller chassis in HUS VM consists of 2 redundant controller halves Each half contains all physical and logi-

cal elements needed to sustain processing Both storage halves support alternate connection path schemes so if

one fails the other can continue processing for the entire storage system




Redundant power supplies are provided to power each half of the controller In the event of a power supply failure

the power supplies in each half are capable of providing power for the entire system

System Monitoring Network

The system monitoring network in Hitachi Unified Storage VM connects to all cabinets and reports on a variety of

system conditions such as component failure fan speed voltages and temperature The network enables efficient

predictive maintenance so components can be replaced before they fail It also expedites system repair after a fail-

ure through the failure alert system

The system-monitoring network passes information to the service processor or remotely across a private LAN on a

UNIX or Microsoft Windows console Failure information is also available via Simple Network Management Protocol

(SNMP) Copies of all system status and alerts are sent to Hitachi Data Systems customer support centers via the

Hi-Track Remote Monitoring system

High Availability

Hitachi Unified Storage VM places emphasis on high availability to satisfy the needs of the most demanding enter-prise applications Hitachi Data Systems offers a combination of unique industry solutions and best-in-class 3rd-party

software integration to deliver unbeatable resilience and availability

Nondisruptive microcode and hardware upgrades

Automatic failover architecture with redundant hot-swappable components

Dual data paths and dual control paths connecting every component

Active-active dual-ported disk drives

Nonvolatile backup of cache using a combination of battery and flash disk drives

Hi-Track Remote Monitoring system which immediately sends notification of any incident that may affect availabil-

ity to the Hitachi Data Systems customer support center




Chapter 3 Software Packages

Hitachi Data Systems storage solutions support a full range of file object and block storage services (see Table 4 )

The solutions give IT the ability to mix and match services to satisfy a desired goal All solutions use open protocols

rather than proprietary APIs to promote interoperability and maintain scalability When combined with Hitachi Unified

Storage VM this complete offering of software solutions allows a single storage solution to support all data types

Block Module Software Bundles

TABLE 4 HITACHI UNIFIED STORAGE VM BLOCK MODULE SOFTWARE BUNDLES

Bundle Hitachi Solution Application

Hitachi Base Operating System (BOS) Hitachi Device Manager

Hitachi Dynamic Provisioning

Hitachi Universal Volume Manager

Hitachi Virtual Partition Manager

Hitachi Dynamic Link Manager

Baseline management tools for Hitachi Unified

Storage VM including virtualization

Hitachi Command Suite Analytics Hitachi Tuning Manager

Hitachi Command Director

Seamlessly gathers and reports storage and

application performance

Hitachi Command Suite Mobili ty Hitachi Tiered Storage Manager

Hitachi Dynamic Tiering

Optimizes tiered storage at the volume or

sub-LUN level

Hitachi Local Protection Hitachi ShadowImage Heterogeneous

Replication

Hitachi Replication Manager

Create and manage internal full and snapshot

copies of volumes

Hitachi Remote Protection Hitachi TrueCopy synchronous remote

replication

Hitachi Universal Replicator

Simplifies data replication between storage

systems

The following sections describe the complementary storage capabilities and software components in depth

Hitachi Command Suite Storage Management

Hitachi Command Suite is an application-centric storage management solution (see Figure 11 ) It incorporates

the internationally recognized Information Technology Infrastructure Library services management best practices

to simplify administration of a common pool of multivendor storage This suite of management software gives

administrators the tools to deliver dependable storage system availability and performance The software offers com-

prehensive management control and discovery for file object and block storage services and reduces complexity

costs and risk in the storage infrastructure




Figure 11 Deep Integration Through a Common Hitachi Command Suite GUI Showing Usability Data Repositories and

Task Workflows

Hitachi Base Operating System (BOS)

Hitachi Base Operating System is a set of fully integrated tools for simplifying storage management and enabling thepartitioning and virtualization capabilities of Hitachi Unified Storage VM (see Table 5 ) BOS utilizes an easy-to-use and

intuitive GUI to centrally manage Hitachi storage systems and also includes a complete CLI It provides user logical

physical and host management views that enable provisioning and storage pooling for primary and secondary stor-

age Base Operating System includes the following individual software components

TABLE 5 HITACHI BASE OPERATING SYSTEM INTEGRATED TOOLS

Tool Function

Hitachi Device Manager y Primary control point for Hitachi Base Operating System

y Provides a single point of management for all Hitachi physical and virtual storage

y Acts as the interface for integration with other systems

Hitachi Dynamic Provisioning y Provides thin provisioning for simplified provisioning operations automatic performanceoptimization and storage space savings

Hitachi Universal Volume Manager y Enables virtualization of external heterogeneous storage

Hitachi Virtual Partition Manager y Supports up to 29 virtual cache partitions


Advanced

y Provides advanced SAN multipathing with centralized management




Hitachi Device Manager

Hitachi Device Manager provides centralized management of multiple Hitachi storage systems Hitachi Device

Manager v7 features a new GUI integrated workflows for improved usability and significant improvements to both

scalability and performance By providing a single console for managing complex storage environments Hitachi

Device Manager software unifies and simplifies storage management

Featuring both an intuitive GUI and a complete CLI Device Manager centrally manages single or multiple Hitachi

storage systems With highly efficient context-sensitive workflows Device Manager supports multiple management

views including physical logical host NAS and virtual server for provisioning and storage pooling for primary and

secondary storage


Hitachi Dynamic Provisioning provides Hitachi Unified Storage VM with thin provisioning services This gives applica-

tions access to virtual storage capacity (see Figure 12 ) As an application writes data to a virtual volume the storage

system dynamically allocates physical disk space from a common pool Unused capacity in the pool is available to

any application that needs it eliminating the waste of overallocated and underutilized application storage capacity

The automated allocation of application storage capacity also dramatically simplifies the storage provisioning process

Dynamic Provisioning reduces the need to perform complex storage system tuning to improve IO performance HUS

VM automatically stripes thin provisioned volumes across the entire width of the physical pool of disks This wide

striping balances the IO load across many disk spindles giving consistently high performance for all IO

Figure 12 Hitachi Dynamic Provisioning Deployed to Reduce the Size Cost and Complexity of the Enterprise Storage

Environment




HUS VM implementation of thin provisioning is unique All internal and externally attached storage resources virtual-

ized by the Hitachi storage controller can participate in the common physical pool used by thin provisioned volumes

Dynamic Provisioning also simplifies storage provisioning and automates data placement on disk for optimal per-

formance Administrators do not need to micromanage application storage allocations or perform complex manual

performance tuning In addition physical storage resources can be added to the thin provisioning pool at any time

without application downtime


Hitachi Universal Volume Manager simplifies migration of applications using 3rd-party storage to HUS VM The soft-

ware eliminates the need to reformat LUNs or perform complex extent mapping providing a minimally disruptive

migration process Once virtualized behind HUS VM external LUNs gain access to all Hitachi storage services


Hitachi Virtual Partition Manager enables the logical partitioning of cache into independently managed virtual

machines (VMs) The number of partitions and partition sizes can be adjusted nondisruptively while HUS VM is inoperation These partitions can be allocated dynamically to utilize resources based on changes in business require-

ments by assigning different IO workloads to different areas of cache Hitachi Resource Partition Manager is also

available as an option for administrative partitioning of Hitachi Unified Storage VM resources

Hitachi Dynamic Link Manager Advanced

Hitachi Dynamic Link Manager Advanced offers robust multipath SAN connections between servers and storage sys-

tems It provides fault-tolerant failover failback and load balancing and centralized path management for improved

information access usability and availability Automatic workload balancing helps to maintain outstanding system

performance across all available paths If one path were to fail Dynamic Link Manager Advanced would automatically

switch the IO to an alternate path ensuring that an active route to data is always available

Hitachi Command Suite Analytics Package

Hitachi Command Suite Analytics Package software gathers information and reports on storage network resources

enabling storage administrators to make informed storage management decisions It includes the following individual

software components

Hitachi Tuning Manager

Hitachi Tuning Manager is an automated intelligent and path-aware storage resource management tool that maps

monitors analyzes and measures storage network resources and performance from the application to the device By

monitoring all storage network resources including hosts file systems databases SAN switches and Hitachi stor-

age systems Hitachi Tuning Manager provides the necessary visibility for complete performance management of the

entire storage environment Through a Web-based interface Tuning Manager facilitates monitoring of the storage net-

work with a comprehensive range of performance statistics combined with predefined reports and custom reportingcapabilities


Hitachi Command Director centralizes management and reporting across Hitachi Command Suite (see Figure 13 )

By consolidating reporting of storage configuration capacity performance and tier information Command Director

provides a business-oriented view into the storage environment This view allows you to easily align Hitachi storage

assets with critical business applications and simplify application-to-storage reporting It also ensures compliance to

application-specific storage service levels




Figure 13 Hitachi Command Director Business-Oriented View of Storage

Hitachi Command Suite Mobility Package

Hitachi Command Suite Mobility Package software is used to optimize the systemrsquos tiered storage capabilities at the

volume or sub-LUN level It includes the following individual software components

Hitachi Tiered Storage Manager

Hitachi Tiered Storage Manager provides the unique ability to migrate volumes between heterogeneous tiers of stor-

age without affecting application access to data The software supports up to 64 simultaneous migrations using 64

processor threads and it offers a single interface for all data movement between storage virtualized by Hitachi Unified

Storage VM


Hitachi Dynamic Tiering extends Hitachi Dynamic Provisioning and takes the automation of tiered storage to a new

level (see Figure 14 ) It enables the management of multiple storage tiers as a single entity It presents a new kind of

virtual volume with embedded smart tiering that monitors access and moves data at the fine grain page level

Dynamic Tiering uses a dynamic storage pool that is divided into 42MB pages Virtual volumes are made up of pages

from the dynamic storage pool Each page is mapped to a tier within the pool and can be anywhere in the pool on

any tier within that pool HUS VM through Dynamic Tiering determines which pages it is best to place in higher tiers

and which in lower tiers The pages can be moved up and down between the tiers within the pool for performance

optimization purposes

A Hitachi Dynamic Tiering environment will have most of the highly referenced pages in the highest tier and the leastreferenced pages in the lowest tier Dynamic Tiering will try to use highest tiers as much as possible This can provide

the effective appearance that all the data is on the fastest tier of storage in fact most of the data resides on lower

cost lower performance storage tiers composed of SAS drives The lowest tier also contains much of the spare

capacity

A Dynamic Tiering volume is another type of volume in a virtualized storage architecture Just like disk types and

RAID configurations multitier volumes are another way of delivering storage with tailored cost and performance ser-

vice levels Capacity can be dynamically added to or removed from a tier at any time which means that sizing a tier

for a pool is much easier




Figure 14 Volume Page and File System Tiering

With Dynamic Tiering the storage administrator does not need to classify data or define policies Once the tiers are

configured the storage system does all the work freeing up the storage administrator to focus on other storage-

related responsibilities

Hitachi Local Replication Package

Hitachi Local Replication Package software is used to both replicate full volumes as well as create snapshot copies of

internal volumes It includes the following individual software components

Hitachi ShadowImage Heterogeneous Replication

By providing nondisruptive high-speed data replication within any Hitachi storage system or virtualized storage poolHitachi ShadowImage Heterogeneous Replication software enables immediate use of data in decision support soft-

ware testing and development and data protection operations ShadowImage cloning operations are independent

of operating system application or device allowing efficient and centralized replicated storage volume management

ShadowImage software provides heterogeneous replication between any storage systems within a virtualized stor-

age pool managed by Hitachi Unified Storage VM Leveraging the storage virtualization capabilities of the platform

administrators can move data that resides on an externally attached storage system from the source to a target data

volume anywhere in the storage pool including to another externally attached system


With Hitachi Replication Manager administrators can configure monitor and manage any replication systems that are

based on Hitachi storage systems Combining robust reporting mirroring and features previously available in separate

offerings it manages in-system or distance replication for open systems environments Replication Manager simplifiesand optimizes configuration operations task management automation and monitoring of the critical applications and

storage components of your replication infrastructure

Hitachi Remote Replication Package

Hitachi Remote Replication Package software is used to replicate volumes between primary and secondary data cen-

ters It includes the following individual software components




Hitachi TrueCopy Synchronous Remote Replication

Hitachi TrueCopy synchronous remote replication software duplicates data from one Hitachi storage system to

another across any distance It automates the recovery process and enables normal business operations to resume

in minutes rather than hours or days following an outage at the primary site TrueCopy software provides host-

independent data replication including heterogeneous replication capabilities for any type of data across any dis-

tance without affecting application performance Copies generated by Hitachi replication software products can be

used for the rapid recovery of production systems or the restart of production on disaster recovery systems following

an outage They can also be used for data warehousing data mining or data migration applications


Hitachi Universal Replicator delivers the industryrsquos first multiplatform multivendor remote copy capability Supporting

asynchronous real-time replication of data from one Hitachi Unified Storage VM to another the software gives stor-

age administrators a consistent replication approach using a common set of procedures tools and skills for all data

center storage

Conventional replication solutions push updates from the primary storage system to a remote location Universal

Replicator running on HUS VM at the remote site pulls changes from journal volumes maintained by HUS VM running

Universal Replicator at the primary site This approach offloads replication overhead from the primary storage system

and dramatically reduces the impact of replication on the business application Transmitted record sets include a

sequence number enabling the replication engine to verify receipt of all records at the remote site and to sequence

writes in the correct order for storage replication

Resource Partition Manager (optional software package)

Hitachi Resource Partition Manager software enables administrative partitioning of Hitachi Unified Storage VM

resources (see Figure 15 ) It can be used with local authentication or it can be integrated into corporate directory

services and security systems using standard management interfaces such as Active Directory LDAP and RADIUS

Solving both security and audit or compliance issues Hitachi Resource Partition Manager enables management ofshared storage assets by different groups




Figure 15 Resource Groups That Allow Greater Administrator Granularity and Flexible Partitioning

File Module Software Bundles

Hitachi Base Operating System F provides multiprotocol file services dynamic provisioning intelligent file tiering file

virtualization and unified directory structure Intelligent file tiering helps organizations move data among storage and

archive tiers with automated policy-driven migration tools This integration of NAS with Hitachi Content Platform and

Hitachi Data Discovery Suite features combines NAS archive index and search technologies

Tiered file system (TFS) also known as ldquometadata optimizationrdquo separates file system metadata from user data

and automatically places metadata on the highest tier for improved performance and storage cost-efficiency

Complementary to the policy-based intelligent file tiering capability it migrates data between different file systems

Cluster namespace creates a unified directory structure across storage pools and servers Multiple file systems

appear under a single common root and both Server Message Block (SMB) and Network File System (NFS) clients

obtain global access through any cluster node Virtual file system supports SMB and NFS protocols for flexibility and

power to handle very large files and millions of small files plus concurrent file system operations with no performance

impact Automatic file system expansion is also available




TABLE 6 HITACHI UNIFIED STORAGE VM FILE MODULE SOFTWARE BUNDLES

Bundle Hitachi Solution Options

Basic Operating System F (entry level) CIFS and NFS File system recover from snapshot

2x virtual server Cluster namespace

Storage pool Replication bundle

FS audit Data Migrator

File system rollback XVL (cross volume links)

Quick snapshot restore Virtual server migration

HA cluster iSCSI

Entry 90-day trial license Read caching

Virtual server security

WORM

Basic Operating System F (value level) CIFS and NFS Replication bundle

4x virtual server Data Migrator

Storage pool XVL (cross volume links)

FS audit Virtual server migration

File system rollback iSCSI

File system recover from snapshot Read caching

Quick snapshot restore Virtual server security

Cluster namespace WORM

HA cluster

Value 90-day trial license

Basic Operating System F (ultra level) CIFS and NFS Virtual server migration

64x virtual server iSCSI

Storage pool Read caching

FS audit Virtual server security

File system rollback WORM

File system recover from snapshot

Quick snapshot restore

Cluster namespace

Replication bundle

Hitachi Data Migrator

XVL (cross volume links)

HA cluster

Ultra 90-day trial license

Disaster Recovery

The disaster recovery capabilities of BlueArc JetMirror based on object replication bring data back online quickly and

efficiently through enhanced tools that automate system failover and failback A source file system can be included

in multiple replication schedules allowing for multitarget replication The snapshots and replication states for each

replication job are separately maintained This software also supports file replication which allows it to recover a more

granular subset of files compared to object replication which works only at the file system level




BlueArc JetClone software performs cloning at the file level Using this software multiple copies or clones of single

files are made by taking snapshots of that file and saving subsequent differences separately By referring back to the

original file for most of the data the software avoids making multiple copies of the common elements of the file Using

BlueArc JetClone entire development and production environments can be deployed in a matter of minutes with littleincremental storage cost

Hitachi NAS Virtual Infrastructure Integrator specifically developed for VMware environments provides snapshot

management from within a vCenter console As an integrated plug-in to vSphere Hitachi NAS Virtual Infrastructure

Integrator allows vSphere administrators to work from their existing management interface to create snapshots for

backup or recovery of virtual machines and VMDK files Possible choices are instant on-demand snapshots taken

by the user policy-based snapshots or orphan snapshots from deleted file module storage systems and VMs

Policy-based retention allows the administrator to define the preservation timeframe by snapshot freeing up storage

capacity The administrator can define snapshot retention by the number of backups the number of days or a mix-

ture of both backups and days

Conclusion A Single Virtualized Platform for all DataHitachi Data Systems offers a unique approach to storage management a single virtualized platform for all data

(structured and unstructured) with single-pane-of-glass management for heterogeneous environments We are

focused on the evolving requirements of structured and unstructured data HDS is the only vendor that can provide

you with a single virtualized and scalable data management architecture for all open systems platforms as well as all

data and information types

Figure 16 Hitachi Storage Virtualization






productivity of storage administrators and enable better cost management (power cooling resource sharing) They

support simplified data migration (block and file storage) and higher availability (IOPS and reliability) with less risk(data protection)

The technologies at the core of HUS VM have been developed over multiple generations and many years Our over-

riding goal has been to provide a highly scalable high-performance platform for storage services



copy Hitachi Data Systems Corporation 2012 All rights reserved HITACHI is a trademark or registered trademark of Hitachi Ltd Innovate With Information ShadowImage TrueCopy

BlueArc and Hi Track are trademarks or registered trademarks of Hitachi Data Systems Corporation IBM and AIX are trademarks or registered trademarks of International Business

Corporate Headquarters

2845 Lafayette Street

Santa Clara CA 96050-2639 USA

wwwHDScom

Regional Contact Information

Americas +1 408 970 1000 or infohdscom

Europe Middle East and Africa +44 (0) 1753 618000 or infoemeahdscom

Asia Pacific +852 3189 7900 or hdsmarketingapachdscom




Contents

Executive Summary 3

Chapter 1 Unifed Storage with Enterprise Virtualization 4

A Single Virtualized Platform with Hitachi Unified Storage VM 4

Chapter 2 Hitachi Unified Storage VM Architecture 4

One Platform for All Data 5

Hitachi Unifed Storage VM Hardware Components 5

High-Performance Switched Network 11

Cache and Control Memory 12

Front-End Design 12

High-Performance SAS Back-End Design 13

Chapter 3 Software Packages 17

Block Module Software Bundles 17

File Module Software Bundles 24

Conclusion A Single Virtualized Platform for all Data 26














































































Figure 3









Block Module














4 x 8 WL 6GB SAS





















Flash battery







File Module















face (GUI)

































Drive Trays





cooling fan




















Block Modules





File Modules



Number of VLANs 256




















(500MB each)








Front-End Design









transfer rates





HP HP-UX

IBMreg AIX reg




Oracle Sun Solaris

VMware ESX Server







x SAS 6Gbsec lanes)


directors



(RPM)


SAS

25rdquo 300GB 15K

25rdquo 600GB 10K

25rdquo 900GB 10K

35rdquo 3TB 72K















7D+1P


14D+2P

RAID-1+0




read ratios
























RAID Rebuild











Power Subsystem





















High Availability



































sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom


















































































Figure 3









Block Module














4 x 8 WL 6GB SAS





















Flash battery







File Module















face (GUI)

































Drive Trays





cooling fan




















Block Modules





File Modules



Number of VLANs 256




















(500MB each)








Front-End Design









transfer rates





HP HP-UX

IBMreg AIX reg




Oracle Sun Solaris

VMware ESX Server







x SAS 6Gbsec lanes)


directors



(RPM)


SAS

25rdquo 300GB 15K

25rdquo 600GB 10K

25rdquo 900GB 10K

35rdquo 3TB 72K















7D+1P


14D+2P

RAID-1+0




read ratios
























RAID Rebuild











Power Subsystem





















High Availability



































sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom









Block Module














4 x 8 WL 6GB SAS





















Flash battery







File Module















face (GUI)

































Drive Trays





cooling fan




















Block Modules





File Modules



Number of VLANs 256




















(500MB each)








Front-End Design









transfer rates





HP HP-UX

IBMreg AIX reg




Oracle Sun Solaris

VMware ESX Server







x SAS 6Gbsec lanes)


directors



(RPM)


SAS

25rdquo 300GB 15K

25rdquo 600GB 10K

25rdquo 900GB 10K

35rdquo 3TB 72K















7D+1P


14D+2P

RAID-1+0




read ratios
























RAID Rebuild











Power Subsystem





















High Availability



































sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom























Flash battery







File Module















face (GUI)

































Drive Trays





cooling fan




















Block Modules





File Modules



Number of VLANs 256




















(500MB each)








Front-End Design









transfer rates





HP HP-UX

IBMreg AIX reg




Oracle Sun Solaris

VMware ESX Server







x SAS 6Gbsec lanes)


directors



(RPM)


SAS

25rdquo 300GB 15K

25rdquo 600GB 10K

25rdquo 900GB 10K

35rdquo 3TB 72K















7D+1P


14D+2P

RAID-1+0




read ratios
























RAID Rebuild











Power Subsystem





















High Availability



































sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom





































Drive Trays





cooling fan




















Block Modules





File Modules



Number of VLANs 256




















(500MB each)








Front-End Design









transfer rates





HP HP-UX

IBMreg AIX reg




Oracle Sun Solaris

VMware ESX Server







x SAS 6Gbsec lanes)


directors



(RPM)


SAS

25rdquo 300GB 15K

25rdquo 600GB 10K

25rdquo 900GB 10K

35rdquo 3TB 72K















7D+1P


14D+2P

RAID-1+0




read ratios
























RAID Rebuild











Power Subsystem





















High Availability



































sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom




















Block Modules





File Modules



Number of VLANs 256




















(500MB each)








Front-End Design









transfer rates





HP HP-UX

IBMreg AIX reg




Oracle Sun Solaris

VMware ESX Server







x SAS 6Gbsec lanes)


directors



(RPM)


SAS

25rdquo 300GB 15K

25rdquo 600GB 10K

25rdquo 900GB 10K

35rdquo 3TB 72K















7D+1P


14D+2P

RAID-1+0




read ratios
























RAID Rebuild











Power Subsystem





















High Availability



































sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom













(500MB each)








Front-End Design









transfer rates





HP HP-UX

IBMreg AIX reg




Oracle Sun Solaris

VMware ESX Server







x SAS 6Gbsec lanes)


directors



(RPM)


SAS

25rdquo 300GB 15K

25rdquo 600GB 10K

25rdquo 900GB 10K

35rdquo 3TB 72K















7D+1P


14D+2P

RAID-1+0




read ratios
























RAID Rebuild











Power Subsystem





















High Availability



































sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom









transfer rates





HP HP-UX

IBMreg AIX reg




Oracle Sun Solaris

VMware ESX Server







x SAS 6Gbsec lanes)


directors



(RPM)


SAS

25rdquo 300GB 15K

25rdquo 600GB 10K

25rdquo 900GB 10K

35rdquo 3TB 72K















7D+1P


14D+2P

RAID-1+0




read ratios
























RAID Rebuild











Power Subsystem





















High Availability



































sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom

















7D+1P


14D+2P

RAID-1+0




read ratios
























RAID Rebuild











Power Subsystem





















High Availability



































sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom










RAID Rebuild











Power Subsystem





















High Availability



































sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom



















High Availability



































sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom






























sub-LUN level


Replication



copies of volumes


replication



systems













Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom









Task Workflows







Tool Function








Advanced













secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom
















secondary storage











Environment




























software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom
































software components

























Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom
















Storage VM













capacity














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom














































center storage








































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom

































HA cluster iSCSI



WORM









HA cluster









Cluster namespace

Replication bundle



HA cluster


Disaster Recovery











































wwwHDScom










































wwwHDScom





hus vm architecture

Documents