IBM Linux on Power Cambridge, MA - Red Hatpeople.redhat.com/fmiranda/powersystems/slide_decks... · • Readily available staff with KVM knowledge versus PowerVM • By using RHEV

9.0

Filipe Miranda <[email protected]>Global Lead for Red Hat Products on IBM z Systems and Power SystemsRed Hat Inc.

IBM Linux on Power Cambridge, MA

Red Hat on Power Systems

© Copyright Red Hat Inc 2015

mailto:[email protected]

Topics for this session

Red Hat in a nutshell

Overview of the collaboration between Red Hat and IBM

Understanding the Endianess

Linux on IBM Power Systems

- Advantages of Running Linux on Power Systems- Advantages of Little Endian

RHEV for Power

- Welcome to the Red Hat Enterprise Virtualization - Advantages of RHEV for Power - Red Hat strategy for Power Systems


Red Hat in a Nutshell

* Red Hat Client Data, 2014


8

Red Hat and IBM Power Systems

z Systems

Red Hat Enterprise Linux optimized to Power Systems

(I) https://access.redhat.com/site/articles/111663

JBoss EAP adding Value to your solution Take advantage of the IBM JDK on Red Hat Enterprise Linux for IBM Power Systems (I)


https://access.redhat.com/site/articles/111663

Red Hat Enterprise Linux 7.1


"Customers who are using the IBM Power Systems platform as part of their datacenter infrastructure, Red Hat Enterprise Linux 7.1 now includes support for POWER8 on IBM Power Systems (based on little endian)."

https://www.redhat.com/en/about/press-releases/red-hat-continues-platform-innovation-general-availability-first-minor-release-red-hat-enterprise-linux-7

https://www.redhat.com/en/about/press-releases/red-hat-continues-platform-innovation-general-availability-first-minor-release-red-hat-enterprise-linux-7

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Understanding Endianess


Endianess

The terms endian and endianness refer to the convention used to interpret the data when are stored in computer memory.

In computing, memory commonly stores binary data by organizing it into 8-bit units called bytes.

When reading or writing data, into memory, consisting of multiple bits, the order of the bytes stored in memory determines the interpretation of the data.

What is endian and endianness?


Each byte of data in memory has its own address.

Big-endian systems store the most significant byte in the smallest address and the least significant byte is stored in the largest address

Endianess

Little-endian systems, in contrast, store the least significant byte in the smallest address.


Both forms of endianness are in widespread use in computing and networking.

As examples, the Intel x86 processor represents a common little-endian architecture, IBM z Systems and IBM Power Systems all big-endian; starting with IBM POWER8, IBM Power Systems now offers a hybrid architecture, both little-endian and big-endian.

Endianness is important as a low-level attribute of a particular data format.

Failure to account for varying endianness across architectures when writing software code for mixed platforms and when exchanging certain types of data might lead to failures and data corruption.

Endianess

Why is the endianness important ?


9.0© Copyright Red Hat Inc 2015

Linux on Power Systems


Most applications from x86 will work on Red Hat Enterprise Linux LE, and require a simple recompile.Red Hat has made it easier for customers to have choice and flexibility, however simply migrating Linux applications from an x86 machine to a IBM Power Systems server doesn't guarantee it will work.

Here are several architecture-specific differences you should consider before porting your x86 Linux applications to Power-based platforms:

• Endianness or byte ordering • Data type length in 32- and 64-bit environments • Data alignment differences in the architectures



Why Run Linux on IBM Power Platform?

Raw performance: You may be running a large Linux server farm but not getting satisfactory performance. You may need massive horsepower, and your application might not work well with a clustering of PCs.

Virtualization robustness You may want the maximum flexibility you can have to share unused resources, allocate and logically partition your servers.

Leveraging existing resources: You may already have a large staff of Linux support personnel. You've fallen in love with the Power Systems platform for all of the reasons mentioned so far and don't want to invest the money in retraining your staff on UNIX.

Datacenter consolidation: Sometimes, it seems every large company over the past several years has performed a server consolidation of some kind.

Etc…



The bottom line is, by combining the flexibility and cost savings of Linux with the scalability and robustness of the POWER platform, customers across all industries can integrate their environments using Linux on POWER to reduce costs and consolidate workloads.


Running little endian mode:

• Accelerates business application innovation by eliminating a significant and outdated barrier to application portability.

• Leverages the significant existing ecosystem of Linux applications previously developed and restricted to x86 architectures.

• Enables simple data migration• Simplifies data sharing (interoperability) with Linux on x86• Improves I/O options with modern I/O adapters and devices, e.g. GPUs

Linux Little Endian for Power Systems increases business’ choice, flexibility and access to open standard solutions. It eases application migration from one platform to the other to take advantage of innovation anywhere, and any time.

Red Hat Enterprise Linux for Power, Little Endian

Why run Linux Little endian on Power Systems ?


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Virtualization Strategy



IBM PowerVM


KVM Virtualization Strategy

TargetLinux-only servers

Mid-range


RHEV for Power



RHEV Manager


RHEV for Power

• Coexist with RHEV environments for x86: Simply add Power Systems with Linux guests to the current x86 environment and take advantage of a single graphical console to manage both distributed systems and Power Systems.

• Open Source Technology: Using RHEV for Power will allow customers to benefit from the KVM virtualization technology without having to learn another hypervisor (IBM PowerVM) when managing Linux guests.

• Readily available staff with KVM knowledge versus PowerVM

• By using RHEV for Power, or simply RHEV - you can integrate your environment with other products from Red Hat, such as Cloudforms, to manage Linux cloud environments.

What are the advantages of RHEV for Power?


Filipe Miranda <[email protected]>Global Lead for Red Hat Products on IBM z Systems and Power SystemsRed Hat Inc.

Sources:http://en.wikipedia.org/wiki/Endiannesshttp://www.ibmsystemsmag.com/aix/trends/linux/Linux-on-POWER/?page=1http://www.zdnet.com/article/red-hat-joins-the-ibm-power8-party/http://openpowerfoundation.org/introducing-the-little-endian-openpower-software-development-environment-and-its-application-programming-interfaces/http://ptakassociates.blogspot.com/2014/12/red-hats-release-of-linux-71-little.html

mailto:[email protected]

http://en.wikipedia.org/wiki/Endianness

http://www.ibmsystemsmag.com/aix/trends/linux/Linux-on-POWER/?page=1

http://www.zdnet.com/article/red-hat-joins-the-ibm-power8-party/

http://openpowerfoundation.org/introducing-the-little-endian-openpower-software-development-environment-and-its-application-programming-interfaces/

http://ptakassociates.blogspot.com/2014/12/red-hats-release-of-linux-71-little.html

Documents

IBM Linux on Power Cambridge, MA - Red Hatpeople.redhat.com/fmiranda/powersystems/slide_decks... · • Readily available staff with KVM knowledge versus PowerVM • By using RHEV