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Servers  >  Linux on IBM eServer
Linux on iSeries

  Planning for Linux

Linux on an iSeries system is unique because there is a choice of environments in which it can be run. Understanding the environments, is the first step in the Linux planning process since it affects the hardware requirements in the LPAR planning phase.

->Minimum iSeries hardware and software requirements for Linux

  Hosted vs non-hosted

  1. Hosted environment. In a hosted environment, one or more Linux partitions have access to certain hardware of a "hosting" OS/400 partition. This hardware includes Disk, Tape and CD-ROM. It is possible to run this type of Linux partition with no external I/O making it very cost efficient to create many Linux partitions within an iSeries system. A hosted partition may however use any configured native I/O, i.e. an ethernet adapter for communication externally from a firewall.
  2. Non-Hosted environment. In a non-hosted environment, the I/O and devices must be completely provided through native attach hardware. A non-hosted partition does not have access to Tapes, CD-ROM's or Disks in an OS/400 partition. Additionally, because it is not possible to move hardware dynamically between Linux partitions, it is not usually feasible to use switchable devices in these partitions.

To learn more about hosted vs. non-hosted, read the Planning for Linux manual in the Info-Center.

  LPAR planning

The second step in planning for a Linux partition is to identify the correct hardware and to plan for the Logical Partitions.

The processor model and feature must be checked to ensure that it is capable of running LPAR and Linux. Linux is only supported on the 8XX models and some 2XX models. Additionally, on some iSeries systems, Linux must run in partitions with whole processors (1-8) while on other systems Linux may run in a partition using a fraction of a processor. This information can be found on the supported systems for Linux charts.

Once the iSeries system is selected and you have identified your partitions and resources, go to the LPAR planning web site and download the LPAR Validation Tool. This tool emulates an LPAR configuration and validates that the planned partitions are valid. In addition, the LPAR Validation Tool allows you to test the placement of OS/400 and Linux hardware within the system to ensure that the placement is valid.

  Technical assistance

Technical assistance for Linux on iSeries is available through email at This includes requests for technical pre-installation conference calls and configuration questions.

Linux support questions must be direct through your normal support channels.

  IBM Service Offerings for Linux

Linux Solution for e-business on iSeries: Linux on iSeries for e-business will provide rapid deployment of a customer's Linux-based e-business environment. This solution will be tailored to fit the specific needs of the customer, by allowing them to select from a wide variety of middleware and applications that will be installed and configured on an IBM supported Linux operating system.

Consolidating to Linux on iSeries: Services consultants can assess, design and implement consolidation to Linux on iSeries for the following workloads: Windows NT - File and Print Serving, TCP/IP Infrastructure serving, SendMail, Apache, and Samba.

Getting to Linux on iSeries: Services consultants will assist customers in developing their own iSeries Linux roadmap for technology enablement. Education on Linux installation and configuration, LPAR as related to Linux, Linux server management, virtual and direct attach I/O, possible JDBC, ODBC, and firewall solutions, and a technology planning session for moving existing workloads from Windows and/or Linux servers to Linux on iSeries are included.

For more information contact, Don Kerlin, IBM eServer Services Architect, at

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