Information Means The World.Information Means The World.

Virtualization Model

ServerServer• VMware• Microsoft

EDREDR(VTL)(VTL)

• Diligent• Quantum DX• NetApp• EMC

ConsolidationConsolidation

• HDS USP & NSC 55• NetApp V-filer• EMC Invista• IBM SVC

Virt

ualiz

atio

n

Competitive Architectures

Host: Traditional volume management

SAN: Symmetric (in-band) Asymmetric (out-of-band)

Storage: Array-based

What is Storage Virtualization?SNIA definition:

– “an act of integrating one or more (back end) services or functions with additional (front end) functionality for the purpose of providing useful abstractions. Typically virtualization hides some of the back end complexity, or adds or integrates new functionality with existing back end services”

Extracting the logical view of data from the physical location and layout,

SANs provide the connectivity base for virtualization of storage

SAN

Host

Storage Controller

Disk Storage

Storage Controller

Disk Storage

Host

Conceptual View of Virtualization

• Creates an abstraction layer between the logical host view of storage and the physical storage

• Normalizes or standardizes the interface between heterogeneous host and storage resources

• Insulates the host from technology changes in the storage

• Facilitates storage asset management and mobility

• View the entire SAN as one pool of storage independent of physical location.

• Mask the differences between heterogeneous devices.• Simplify control and management under a single interface.• Centralize storage volume management on the SAN.• Dynamically allocate capacity to the applications that need it.• Facilitate matching storage resources to business requirements.

IT Benefits of Virtualization

• Reduce storage costs• Optimize utilization of storage resources

– Eliminate stranded capacity– Tiers of storage matched to data life cycle needs– Adjust resources as requirements change

• Improve management efficiency & productivity– Common management & business continuity

software– Independent of hosts and applications– Easier migration

• Increase performance• Reduce downtime• Eliminate vendor lock-in

– Storage systems– SAN fabric– Host operating systems or applications

Business Benefits of Virtualization

Major Benefits of Virtualization – Top 4

1. Simplification of Networked Storage Infrastructure

2. QoS Application Management

3. Dynamic Heterogeneous non-disruptive Data Mobility

4. Heterogeneous Replication

Host Based Virtualization

Volume management– Manages storage separate

from storage subsystem

– Managed on each host

Examples:– Veritas Volume Manager SAN

Host

Storage Controller

Disk Storage

Storage Controller

Disk Storage

Host

Intercept I/O Intercept I/O

Host Based VirtualizationAdvantages:

• Close to the application

• Potential for knowledge of applications

• Can span storage arrays

Disadvantages:

• Operating system specific

• May need re-architecting for SAN/distributed-host awareness

• Sensitive to changes in the server software stack

• Potentially difficult and expensive to deploy

• Limited scalability

• Performance impact– Host CPU utilization

– I/O latency

Network-Based VirtualizationSymmetrical (in-band) virtualization

Appliance in the data path

Examples– IBM SVC

– FalconStor

Host

Storage Controller

Disk Storage

Storage Controller

Disk Storage

Host

VirtualizationAppliance

Intercept I/O

SAN

Network-Based VirtualizationAsymmetrical (out-of-band) virtualization

Appliance re-maps I/O at port level

Examples:– StoreAge

– EMC Invista

SAN

Host

Storage Controller

Disk Storage

Storage Controller

Disk Storage

Host

VirtualizationAppliance

Intercept I/O Intercept I/O

Network-Based VirtualizationAdvantages:

• Can span storage arrays

• Can span hosts

• Cost effective appliance architecture

• Out-of-band appliances– Not in the data path

Disadvantages:

• additional complexity for clustered processors

• Complex integration & testing

• Potential conflict between storage and appliance vendors

• Potential single-point of failure

• Limited scalability

• SAN only attachment

• In-band– I/O latency

• Out-of-band– Requires maps to each host– Requires API’s on the hosts

• Potential security exposures

• Blocks visibility to complete data path – Limits storage management capabilities

Traditional Array-Based Virtualization

• Abstracts data from physical storage– RAID

– Element & volume management functions

– Dynamic allocation of storage volumes

– May provide redundancy & fail-over

– May provide replication & copy functions

• Examples:– Xiotech

– 3Par

SAN

Host

Storage Controller

Host

Disk Storage

Mainframe

Traditional Array-Based Virtualization

Advantages:

• Close to data

• Can span hosts

• No I/O latency – no incremental hardware or software operations in I/O path

• Ability to mask volumes from servers not authorized

• Ability to change/grow volumes

Disadvantages:

• Needs re-architecting to span multiple arrays• Limited virtualization capabilities

– Cannot see entire SAN as one pool

• Limited commonality of management and software tools• Creates potential lock-ins

USP Array-Based Virtualization

• Virtualization within the array• Supports attachment & virtualization of

storage systems

SAN

Host

Storage Controller

Disk Storage

Storage Controller

Host

Storage Controller

Disk Storage

Disk Storage

Mainframe

Virtualization

Universal Storage Platform Array-Based Virtualization

Advantages:

• Close to data

• Can span hosts

• Can span storage arrays

• Not limited to SAN connection

• Mainframe and Open Systems support

• No I/O latency – no incremental hardware or software operations in I/O path

• Highly scalable

• Common Storage Management software

• Robust Business Continuity software suite

• Data migration and copy functions with no Host CPU impact

Disadvantages:

• Not close to application

• price premium

Summary

• Virtualization is the next step in enabling higher storage management productivity

• Virtualization technology is now mainstream and available from our strategic partners

• Virtualization capabilities will be the differentiator in many storage consolidation opportunities

• Be sure to solve a problem and not introduce additional complexity!

IBM SAN Volume Controller (SVC)

• In-band virtualization in software on an appliance in the network

• Released in 2003, current version is 2.1.0

• Open Systems connectivity only, no mainframe

• A number of major issues in early version have been sorted out like SAN-booting, clustered server support and vendor lock-in

• No asynchronous remote replication

• Supports IBM ESS & FAStT, EMC Symmetrix & Clariion, HDS Thunder and Lightning (Sun 9900 & HP XP), HP EVA

• 1000 customers as of April 2005

SVC Technical Description• Software runs on IBM xSeries server

with 4GB RAM seen as a disk array by hosts

• In practice, SVC always consists of an active/active clustered pair of servers with mirrored write-caches across FC for redundancy and performance

• Maximum number of nodes is 8 grouped into pairs or I/O groups, with no sharing of volumes between I/O groups

• Available as a blade for Cisco MDS 9000

• Roadmap probably includes movement of SVC from appliance to LPAR in DS8000

• Four ports per appliance

• Upgrades to SVC’s are disruptive

• 99.9% availability appliances in front of a 99.999% storage arrays?

EMC Invista (Storage Router)

• Out-of-band virtualization in the network using a combination of an appliance and software in switches

• Announced May 16 as a beta, available Q3 2005 through direct sales and full general availability in Q1 2006

• Complete absence of customer cases, detailed technical information, and performance information at announcement

• Co-operation with Brocade (7420 Q3 ‘05), Cisco (MDS 9000 series Q3 ‘05), and McData (Q1 ’06) for intelligent switches

• At present software for migration and provisioning – ONLY (no remote replication)

• Upgraded Invista to arrive Q1 ’06 that may include remote replication, CDP, and mainframe support

• Intended for 50+TB and 100+ port SANs

EMC Invista Technical Description

• Intelligent switches will contain ASICs for I/O redirection at wire speed

• Host can connect directly to intelligent switches or for a larger fan-in to a standard fabric connected to intelligent switches

• Vendor APIs for the intelligent switches (different for different switches) rather than custom code allows for third party implementations of virtualization functionality. Functionality will eventually merge through FAIS

• Software component of Invista runs on out-of-band appliance called Control Path Cluster

• Does not consolidate remote replication for heterogeneous storage systems – uses individual replication tools for individual arrays

Architecture ComparisonRequires Universal Volume Manager license ONLY

to enable virtualization environment

Less Expensive to Implement

on Enterprise or Midrange

Maps all storage controller-based functions

across heterogeneous storage

No Additional Hardware Required

Support for Mainframe (ESCON, FICON)

Support for NAS with NAS blade (CIFS, NFS)

Delivers more Functionality and Benefits

than any other competitor

All Unique to

Hitachi TagmaStore™

Universal Storage Platform

and Network Storage Controller

HP EVA Series • Provides single-system virtualization ONLY

• Categorized as “array-based” virtualization, as opposed to “storage controller-based” virtualization.

• Should not be confused with heterogeneous virtualization solutions (NSC, Invista, SVC)

• Original Compaq EVA, announced Oct. 2001

• EVA V2 , with integrated Vixel Switch, GA July 2002

• EVA 8000 (high-end midrange) and EVA 6000 (midrange), EVA 4000 (low-end)

• HP resells both Universal Storage Platform (XP12000) and Network Storage Controller

Smaller Niche Players

3ParData, XIOTECH, Pillar Data Systems

• Provides single-system virtualization ONLY

• Does not provide heterogeneous virtualization platform

• Does not address heterogeneous data mobility and replication

• Does not deliver enterprise (switch) architecture to midrange space

• Provides “thin” or “over” provisioning capabilities

NetApp V-Series Virtualization Solution

• Common management for heterogeneous storage

• Proven data management software portfolio

– For sharing, consolidating, protecting and recovering mission critical data

• Dynamic heterogeneous virtualization

– SAN, IP SAN and NAS– Dynamic provisioning– Thin provisioning– Virtual cloning

• Tiered heterogeneous storage array support

NAS, SAN,IP SAN

Data Access

Tiered Heterogeneous Storage

Local /Remote

HitachiIBM HP

Block Virtualization File Virtualization

Enterprise Data & Storage Management

Enterprise FC SAN

V-SeriesSystems

Host Environment (Unix, Windows, Linux)