IBM z/OS manual Z990 Support for Linux, Linux on zSeries, IBM Middleware

z990 Support for Linux

Linux on zSeries

Linux and zSeries are a great team. Linux has the same appearance and application programming interfaces no matter what platform it is running on, since it is designed to be platform-independent. When Linux is run on a zSeries server it can inherit the legendary qualities of service that businesses worldwide rely on for hosting their most impor- tant workloads. Linux is open standards-based, supporting rapid application portability and can be adapted to suit changing business needs. The fl exibility and openness of Linux make it very popular with developers, whose contri- butions endow Linux with an extensive and diverse appli- cation portfolio. zSeries servers enable massive scalability within a single server, either horizontally or vertically. Hun- dreds of Linux images can run simultaneously, providing server consolidation capabilities while helping to reduce both cost and complexity.

Of course, no matter which Linux applications are brought to the zSeries platform, they can all benefi t from high- speed access to the applications and corporate data that reside on zSeries.

IBM developed the code that enables Linux to run on zSeries servers, and made it available to the Open Source community. The term used to describe this enabling code is “patches.”

To eliminate the need for an external 2074 Console control- ler and associated consoles, an administrator may utilize the Hardware Management Console (HMC) functions "Inte- grated 3270 Console Support" for operating z/VM images, and "Integrated ASCII Console Support" to operate Linux images.

The support is implemented using an internal communi- cations method — SCLP — which enables the operat- ing system to communicate with the HMC. The software support was made available in z/VM Version 4 Release 4. An update for Linux will be made available to IBM Linux Distribution Partners.

Linux on zSeries supports the 64-bit architecture avail- able on zSeries processors. This architecture eliminates the existing main storage limitation of 2 GB. Linux on zSeries provides full exploitation of the architecture in both real and virtual modes. Linux on zSeries is based on the Linux 2.4 kernel. Linux on S/390 is also able to execute on zSeries and S/390 in 32-bit mode:

IBM Middleware

•Connectors

–DB2 Connect™ Version 8.1

–DB2 Connect Enterprise Edition Version 7.2

–DB2 Connect Unlimited Edition Version 7.2

–CICS Transaction Gateway Version 5.0

–IMS Connect Version 1.1 and 1.2

•WebSphere Family

–WebSphere Application Server Version 5.0

–WebSphere Application Server for Developers Version 5.0

–WebSphere Application Server Network Deployment Version 5.0

–WebSphere Application Server Advanced Edition 4.0

–WebSphere Application Server Advanced Single Server Edition Version 4.0

–WebSphere Application Server Advanced Developer Edition Version 4.0

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