suse linux for z

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SUSE Linux Enterprise Server forSystem zFrequently Asked Questions

February 2012

FAQwww.suse.com


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W h a t i s I B M S y s t e m z ?

IBM System z servers are large-scale computer systems, which are mainly used by customers for business-critical

installations in organizations which need very high availability and reliability. For such organizations, System z

machines normally provide a lowertotal cost of ownership than other platforms, especially when running a variety of

workloads concurrently. IBM System z servers have become well known for server virtualization and workload

consolidation through their superior capabilities, which provide the opportunity to minimize IT costs. Linux

environments on System z servers build on the outstanding capabilities of z/VM virtualization. They focus on optimal

resource utilization, high flexibility, easy and fast provisioning, load-balancing and efficient systems management.

The z hardware technology is designed to run multiple and different workloads in parallel, and provides a balanced

system, internal networking, and unmatched levels of availability and security.

I a m n e w t o L i n u x o n S y s t e m z . W h a t i s a n I F L ?

The Integrated Facility for Linux, or IFL for short, is a specialty engine for the IBM mainframe dedicated to running

Linux with or without z/VM. IFLs are one of three types of mainframe processors expressly designed to reduce

software costs. (The other types are zAAP for Java code and zIIP for DB2.) Microcode restricts IFLs to Linux

workloads by omitting some processor instructions not used by the Linux kernel. For more information, visit

www.03.ibm.com/systems/z/os/linux/solutions/ifl.html

W h a t i s z / V M ?

z/VM is the virtualization technology in System z. In other words, it is an operating system hypervisor designed for

System z (or any equivalent server designed to the z/Architecture). Using z/VM you can run different operating

systems such as z/OS and SUSE Linux Enterprise Server for System z with different workloads in parallel and invirtual machines on the host mainframe. In addition, z/VM lets you remap and share existing system resources. This

means that your virtual environment can be fine-tuned (even dynamically) to adapt to existing and changing needs.

Capacity (in the CPU, I/O and network) can be added on the fly and redirected if its needed elsewhere. For more

information, visit www.vm.ibm.com/linux/

I n w h a t w a y s c a n L i n u x b e r u n o n t h e m a i n f r a m e ?

On an IFL, Linux can run in standalone mode in a Logical Partition (LPAR) and under z/VM. Currently, approximately

95 percent of Linux deployments on System z are run under z/VM.

W h a t i s S U S E L i n u x E n t e r p r i s e S e r v e r f o r S y s t e m z ?

SUSE Linux Enterprise Server for System z is a commercial Linux operating system specifically tailored for the

mainframe. This means that various z/VM operating system and System z hardware features are exploited by SUSE

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Linux Enterprise Server to ensure that resource sharing, disaster recovery, and other capabilities are available for

SUSE Linux Enterprise Server for System z.

SUSE Linux Enterprise Server for System z lets you consolidate distributed workloads onto System z servers to help

minimize costs, reduce downtime, decrease data center complexity and increase business agility.

I s S U S E L i n u x E n t e r p r i s e S e r v e r f o r S y s t e m z t h e r i g h t h a r d w a r e p l a t f o r mf o r m e ?

SUSE Linux Enterprise Server for System z running on an IBM mainframe is the ideal choice for customers with

existing mainframes that want to add Linux and benefit from the combined advantages, as well as new customers

that decide for the f irst time to buy a System z machine running Linux. Mainly this combined solution is ideal for

customers that:

Host hundreds of virtual servers that run a mix of workload types and need to consolidate their

environment

Are experiencing or projecting IT growth and want a better way to manage that growth with z/VM

Struggle to host I/O and data-intensive workloads in virtual servers with acceptable levels of performance,

scalability, availability, capacity planning or disaster recovery

Need high I/O bandwidth and scalability, or rock-solid system security

W h a t a r e t h e b e n e f i t s o f S U S E L i n u x E n t e r p r i s e S e r v e r f o r S y s t e m z ?

When Linux is combined with IBMs industry-leading virtualization technologyz/VMrunning in a System z

environment, it delivers the high level of availability and productivity required in todays global, networked

environment. Leveraging all of these exceptional System z capabilities with Linux on z/VM can improve the total cost

of ownership in your IT infrastructure. Together, IBM and SUSE are introducing IT organizations to the compelling

business value of hosting virtual servers on System z with z/VM and Linux. With SUSE Linux Enterprise Server for

System z, you can take advantage of the following benefits:

Reduced training costs and increased productivity of IT staff

Reduced software costs by consolidating a large number of virtual machines per System z core

Reduced energy costs and power usage

Reduced facilities costs and floor space with dense server consolidation on System z

I h e a r d t h a t m a i n f r a m e s , w h e n u s e d f o r s e r v e r v i r t u a l i z a t i o n a n d r u n n i n g

L i n u x , m a y l o w e r t o t a l c o s t o f o w n e r s h i p ( T C O ) c o n s i d e r a b l y . W h a t k i n d o f s a v i n g s d o I g e t ?

Per-processor software licenses can be shared among multiple Linux virtual servers running on a single mainframe.

These processors can either be a standard engine, or an IFL engine. An IFL is a specialty processor from IBM that is

designed to make it more economical to run Linux workloads on the mainframe. An Oracle license for a standard

engine or IFL, for example, is the same price as an Oracle license for a one-processor x86 server.

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The more, a mainframe requires only about 20 percent of the floor space and power usage of comparable capacity

x86 servers. When IBM releases a new processor technology, it is typically much faster and has more green

features, which normally provides for additonal savings.

W h a t a r e t h e m o s t i m p o r t a n t a d v a n t a g e s , i n t e r m s o f f u n c t i o n a l i t y , t h a t a r eg a i n e d b y r u n n i n g S U S E L i n u x E n t e r p r i s e S e r v e r o n a m a i n f r a m e ?

Faster server provisioning in the form of virtual servers (minutes or hours versus days and weeks)

Higher performance communication among Linux virtual servers and other system components such as

z/VM and z/OS running on the same System z hardware

Inherited disaster recovery

Higher utilization for mixed workloads

Data center in a boxMultiple complete in-tier applications in one physical footprint

W h a t w o r k l o a d s a r e b e s t s u i t e d f o r S U S E L i n u x E n t e r p r i s e S e r v e r f o r S y s t e m z ?

A mixture of high I/O transaction-oriented to moderately CPU intensive workloads are best for mainframes; however,

Oracle, SAP, IBM middleware, and many other ISVs contribute to the more than 3,150 applications running on Linux

on the mainframe. Almost all of IBMs middleware applications run on SUSE Linux Enterprise Server for System z. In

addition, hundreds of open source applications, such as Apache, MySQL and Samba, that run on SUSE Linux

Enterprise Server for x86 servers, also run on the mainframe. With technologies like Mono, SUSE and IBM are even

driving new workloads to the platform.

H o w m a n y u s e r s a r e r u n n i n g L i n u x o n t h e m a i n f r a m e ?

Gartner1believes that approximately 30 to 35 percent of IBM System z customers are actively using Integrated

Facilities for Linux (IFLs), and that there are around 7,000 IFLs installed worldwide. IBM has made steady progress

in expanding the use of Linux on the mainframe. Approximately 15 percent of the total mainframe MIPS installed

worldwide are Linux MIPS. Today, Linux on System z offers a powerful combination used by more than 1,300 clients

around the world to run business-critical transactions, such as powering global financial networks. The outlook for

growth remains good, with a market penetration of 50 percent of the System z installed base by the end of 2012.

W h y s h o u l d I c h o o s e S U S E L i n u x E n t e r p r i s e S e r v e r f o r S y s t e m z o v e r o t h e rL i n u x d i s t r i b u t i o n s f o r m a i n f r a m e s ?

SUSE Linux Enterprise Server for System z is the market-leading Linux operating system for IBM System z, and it

incorporates more than 12 years of technology and business expertise for Linux on the mainframe. In 1999,SUSE

GmbH started its cooperation with IBM and Marist College to move the available Linux code into an enterprise-ready

Linux distribution. Since that time, SUSE has been on the forefront of Linux on System z. SUSE Linux Enterprise

1 Gartner "Common Questions About Linux on Mainframe Trends" August 17 2009

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Server for System z has been available to customers since 2000. Entering this new market, it was the only available

enterprise-class Linuxcommercially maintained and supportedthat delivered the reliability, availability and

serviceability (RAS) expected by IBMs mainframe customers.

Although other enterprise-like Linux offerings entered the market, SUSE Linux Enterprise Server clearly dominates

the Linux mainframe market, with a share of 80-plus percent today. When you consolidate workloads using SUSE

Linux Enterprise Server for System z, you receive all the benefits of mainframe computing and Linux, including high

reliability, immense scalability, solid security, and the ability to consolidate distributed workloads cost effectively.

W h a t i s t h e r e l a t i o n s h i p b e t w e e n S U S E a n d I B M i n t h e d e v e l o p m e n t o f S U S E L i n u x E n t e r p r i s e S e r v e r f o r S y s t e m z ?

SUSE and IBM continue to work very closely together in Germany at the SUSE office in Nuremberg and IBM's

Boeblingen development center.SUSE continues to be the first to take advantage of the hardware capabilities ofIBM's System z for Linux and is typically first to work with IBM to support new features and to make those

advancements available in the mainstream Linux kernel. SUSE and IBM, in conjunction with IBMs mainframe

customers, are working together to determine what changes to make to the Linux kernel so you can take advantage

of System z hardware and the z/VM operating system. These changes are submitted to the Linux kernel to the

upstream Linux development team. For example, in the latest versions of SUSE Linux Enterprise Server alone,

SUSE has implemented nearly 170 features specifically focused on enhancements for SUSE Linux Enterprise

Server for System z.

W h a t a r e s o m e o f t h e f e a t u r e s t h a t h a v e b e e n i m p l e m e n t e d w i t h S U S E L i n u xE n t e r p r i s e S e r v e r f o r S y s t e m z 1 1 ?

With SUSE Linux Enterprise Server for System z 11 SUSE has implemented many IBM and joint-customer

requirements to enhance SUSE Linux Enterprise Server for System z, including:

Dynamic add/remove of CPU/memory: This allows you to adjust resources of a Linux system in an

LPAR or guest under z/VM, while it is running.

Cross architecture debugging: System z core dumps can be analyzed in x86 systems, negating the

need for a duplicate System z server.

Higher performance analysis in the disk subsystem: This feature allows performance analysts to find

out where bottlenecks are occurring in a system.

Vertical CPU management: With the System z10 being more NUMA-like than previous generations of

System z servers, this feature will help get the most performance out of the hardware because it is aware

ofthose NUMA characteristics.

W h a t i m p o r t a n t f e a t u r e s h a v e b e e n i m p l e m e n t e d w i t h S e r v i c e P a c k 1 ?

With SUSE Linux Enterprise Server for System z 11 Service Pack 1, most of the new features of version 11 have

been taken even further. Here are just some of the most important new and enhanced features you'll find in the

latest version:

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Large page support: This provides the possibility for processes to allocate process memory in chunks of

2 MB instead of 4 KB. This boosts performance as better system throughput is achieved with large page

support.

Suspend/resume support: With this feature, you can stop a running SUSE Linux Enterprise Server for

System z instance and later continue operations. When the Linux instance is suspended, data is written to

a swap partition. This gives you better performance, resource utilization and power savings.

Automatic initial program load (IPL) after dump: This feature helps increase availability and minimizedowntime, as well as keep management and service costs low.

DS8000 support/large volume support: With this feature, you can now use one large volume, instead of

multiple small volumes, for your large quantities of data. You no longer need to combine and manage

various small disks anymore. This gives you much better performance and data consolidation.

Support of the new high performance FICON (HPF) TCW command interface in the DASD driver:

This feature increases performance for database serving.

Next-generation crypto hardware features and performance improvements: These features are

exploited by SUSE Linux Enterprise Server for System z. Hardware-driven crypto acceleration functions

such as CPU offload, which results in increased security and helps you reduce operations and

maintenance costs. They also help you get high-performing and highly secure servers with high

transaction rates.

W h a t i s n e w w i t h S e r v i c e P a c k 2 ?

With Service Pack 2, SUSE has implemented more than 75 new features specifically focusing on enhancements for

SUSE Linux Enterprise Server for System z. Many of the new features and improvements in this release again are a

direct result of customer collaboration and SUSE's commitment to meeting our customer requirements.

This update delivers significant advances in performance and I/O throughput, systems management, system

diagnosis and problem resolution, as well as special features for the exploitation of the latest IBM zEnterprise

hardware. To name just a few:

Kernel 3.0: SUSE Linux Enterprise Server for System z 11 SP2 includes the Linux 3.0.x kernel derivedfrom the upstream stable branch, which allows for enablement of the most recent hardware, and provides

massively improved I/O throughput and performance.

Enhanced CPU node affinity support for z196: This feature allows the Linux kernel scheduler to

optimize its decisions based on the z196 processor, cache and book topology, and provides for increased

application workload density per system and much better performance

FICON DS8000 Solid State Drive support: Transparent to the DASD device driver, no change is needed

to use solid state disks. A new flag in the device characteristics will show the administrator if a device is a

solid state disk. Thus workloads can be placed on the storage that supports best their I/O characteristics.

In consequence, random I/O is accelerated, sequential I/O can be placed cost effective.

z196 exploitation via alternate GCC: This feature provides for performance improvement for applications

through the exploitation of new z196 processor instructions and optimized alignment of code. This

increases the application workload density per system, less time and cycles are used for the same

workload.

FICON Dynamic PAV toleration: The DASD device driver tolerates dynamic Parallel Access Volume

(PAV) changes for base PAV. PAV changes in the hardware configuration are detected and the mapping

of base and alias devices in Linux is adjusted accordingly. This improves the flexibility and availability of

SUSE Linux Enterprise Server for System z, by allowing to tolerate changes in the PAV infrastructure

without the need to restart the system

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W h a t i s t h e S U S E L i n u x E n t e r p r i s e S e r v e r S t a r t e r S y s t e m f o r S y s t e m z ?

Unique to SUSE Linux Enterprise Server for System z is the Starter System for System z.Historically, one of the

biggest hurdles to implementing Linux on the mainframe has been gaining network access to the installation media

from the mainframe (e.g., the installation routine cannot access built-in DVD reader or firewall rule changes are

needed). SUSE Linux Enterprise Server Starter System for System z is a pre-built installation server that facilitates

the installation of SUSE Linux Enterprise Server for System z on a z/VM system. It eliminates the network access

hurdle to test Linux on the mainframe and gives you network access to the installation media from the mainframe. It

also allows customers with little or no Linux or z/VM experience to initiate evaluations of SUSE Linux Enterprise

Server for System z. It is free and is perfect for proof-of-concept evaluations. However, you do need a mainframe

and z/VM. If you do not have z/VM, you can get an evaluation copy from IBM. Read more at

www.suse.com/partners/alliance-partners/ibm/mainframe/starter-system.html

D o e s S U S E L i n u x E n t e r p r i s e S e r v e r f o r S y s t e m z i n h e r i t o t h e r a d v a n t a g e s

f r o m t h e S U S E L i n u x E n t e r p r i s e p l a t f o r m ?Besides the specific System z features, SUSE Linux Enterprise Server for System z also has some unique

advantages that come with the SUSE Linux Enterprise platform:

SUSE Linux Enterprise Server for System z is part of the SUSE Linux Enterprise Common Code Base.

This means the versions, and thereby the source code, of all core packages of the SUSE Linux Enterprise

product family are the samefrom the desktop to the mainframe. The toolchain, like compilers and

libraries (glibc), are the same across the supported hardware architectures. The common code base

guarantees product consistency and a persistent look and feel, which lets you leverage the skills of your IT

staff. Additionally, it stands for the highest code quality, better supportability and preemptive code

maintenance.

The internal Build Service, unique to SUSE Linux Enterprise, is the mechanism behind the common code

base. Build Service is able to compile (build) whole Linux distributions in a fully automated manner. The

only human interaction happens when the SUSE engineering team specifies the package selection, the

toolchain and the target hardware architecture for the build process.

TheYaST installation and configuration framework is unique because it covers a wide range of

management tasks and features in an intuitive graphical interface. Developed to provide an extensible and

standardized means of systems administration, YaST serves three main purposes: the installation of

SUSE Linux Enterprise products on a system, the configuration of the installed system, and the

administration of the installed system.

AutoYaST provides fully customizable, automatic and remote Linux installation for large numbers of

systems that share a similar environment and similarbut not necessarily identicalhardware, and which

perform similar tasks.

The downloadable Subscription Management Tool for SUSE Linux Enterprise is integrated with Novell

Customer Center and provides a repository and registration target that is synchronized with Novell

Customer Center. The most recent version of the tool can be hosted on System z servers as well. The

Subscription Management Tool helps you centrally manage software updates within the firewall on a per-

system basis, while maintaining your corporate security policies and regulatory compliance. In addition, it

helps you track your entitlements in large deployments. And using the tool, you can avoid redundant

bandwidth requirements by downloading all patches at once. It is included with every SUSE Linux

Enterprise subscription at no additional costwhile the competition is charging for comparable

functionalitiesand is fully supported.

SUSE Linux Enterprise High Availability Extension, included with SUSE Linux Enterprise for System z,

is an affordable, integrated suite of innovative open source clustering technologies. It lets you implement

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highly available Linux clusters. This helps you maintain business continuity, protect data integrity, and

reduce unplanned downtime for your mission-critical Linux workloads. It delivers all of the essential

monitoring, messaging and cluster resource management functionality of proprietary third-party solutions.

High availability is now within the reach of any business.

The SUSE Linux Enterprise Mono Extension enables organizations to run Microsoft .NET-based server

applications on SUSE Linux Enterprise Server. You can leverage existing .NET-based applications, and

build new ones, running them on Linux to reduce cost and increase productivity. For the first time, you canalso use Mono to develop .NET applications for System z and consolidate Windows workloads to the

mainframe.

SUSE Studio provides a new and simple way to create, maintain and deploy System z workloads or

images by automating routine, labor-intensive tasks. You can automate the assembly of new System z

images, normally a time consuming endeavor, which increases efficiencies and further reduces complexity

and costs. SUSE Studio simplifies the creation, testing, and maintenance of images for System z and

leverages the same easy-to-use interface for building mainframe workloads and images for x86 systems.

For more information, visit http://www.suse.com/products/susestudio/

SUSE Managerdelivers best-in-class capabilities that enable enterprises to comprehensively manage

Linux servers with a single centralized solution. SUSE Manager provides automated and cost-effective

software/update management, asset management, system provisioning, and monitoring capabilities. This

enables customers to easily manage Linux server deployments across physical, virtual, and cloud

environments. SUSE Manager can also manage Linux virtual machines on System z, and with future

releases it can be hosted on System z.

W h a t i s t h e p r i c i n g f o r t h e S U S E L i n u x E n t e r p r i s e S e r v e r f o r S y s t e m z ?

SUSE Linux Enterprise Server for System z is priced higher than other architectures and is priced per-IFL specialty

engine or processor. This pricing difference is largely due to the number of virtual machines that can simultaneously

run workloads on a single mainframe processor and other additional specific capabilities that are provided as part of

the System z platform, such as disaster recovery. However, SUSE has put a new pricing model in place. It is called

multi-IFL pricing, and it enables you to manage the total cost of acquisition and the total cost of ownership whenconsolidating workloads to Linux on System z.By ordering your SUSE Linux Enterprise Server for System z

subscriptions via the multi-IFL pricing structure, you will get a price benefit, which scales by volume. In addition,

SUSE consistently has pricing promotions in effect that get you more than you pay for, leading to significant cost

savings. For more information about the special offerings and promotions that are available, visit

www.suse.com/partners/alliance-partners/ibm/mainframe/multiifl.html

H o w c a n I p u r c h a s e S U S E L i n u x E n t e r p r i s e S e r v e r f o r S y s t e m z ?

You can purchase SUSE Linux Enterprise Server for System z from your IBM sales or business partner

representative when you are purchasing a new IBM System z machine, or when you are purchasing new IBM IFLs

for your existing mainframe. You can also purchase it directly from SUSE. You can simply call your SUSE sales

representative or use this form to request a sales call.

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W h e r e d o I g e t m o r e i n f o r m a t i o n ?

For more information about SUSE Linux Enterprise Server for System z, visit

www.suse.com/products/systemz

For more information about offerings, campaigns and promotions for SUSE Linux Enterprise Server

for System z, visit http://www.suse.com/partners/alliance-partners/ibm/mainframe/

For more information about Linux running on IBM System z, visit www.ibm.com/systems/z/os/linux/

For more information about Mono migration guidelines from the Practical Migration to Linux on

System z, an IBM Redbook, visit www.redbooks.ibm.com/redbooks/pdfs/sg247727.pdf

For detailed information on the SUSE support lifecycle, visithttp://support.novell.com

SUSE and the SUSE logo are registered trademarks of Novell in the United States and other countries. All other

third-party trademarks are the property of their respective owners.

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