4 Linux operations
This chapter describes storage system operations in a Linux host environment.
Overview of zLinux operations
The storage system supports attachment to the following mainframe Linux operating systems:
• Red Hat Linux for S/390 and zSeries
• SuSE Linux Enterprise Server for IBM zSeries
For information on supported versions, Linux kernel levels, and other details, contact your HP
representative.
For details on FICON/zHPF connectivity, FICON/Open intermix configurations, and supported
FCAs, switches, and directors (for example, CNT) for the storage system, contact your HP
representative.
For information on preparing the storage system for Linux host attachment, see the IBM
documentation about implementing Linux with IBM disk storage.
After physical installation of the storage system has been completed, the user configures the LINUX
system for operations with assistance as needed from an HP representative. For specific information
and instructions on configuring the disk devices for LINUX operations, see the P9000 disk array
configuration guide for the connected platform. Contact your HP representative for the latest
information on platform and operating system version support.
Running Linux on S/390 or zSeries hosts
There are three possible methods used to run Linux on an S/390 or zSeries host:
• Run Linux in “Native” mode on the machine with no other operating system.
• Create Logical Partitions (LPARs). Logically partition the hardware into up to a maximum of
15 separate LPARs per logical channel storage system. You can, for example, run S/390
applications in one partition, VM and VSE applications in another partition, and Linux
applications in a third partition.
• Use z/VM guest support. Run Linux as a virtual machine using z/VM to provide virtualization
of central processing units, I/O storage systems, and memory.
It is possible to run hundreds of Linux systems on a single S/390 or zSeries host. For example,
you can create a complete Linux server environment for each application developer and host
production system all on the same S/390 or zSeries host.
For SuSE SLES 9 or Red Hat Enterprise Linux 3.0, the storage system supports 31- and 64-bit Linux
for zSeries on storage units as well as FICON and Fibre Channel Protocol (FCP) attached host
systems.
NOTE: zSeries FCP host system running SuSE SLES 9 or Red Hat Enterprise Linux 3.0 can only
be attached through a switched-fabric configuration. Hosts cannot be attached using a direct
configuration.
Attaching FCP adapters to zSeries hosts running Linux
Linux solutions are available for the 31- and 64-bit environments. The availability of this option
depends on the zSeries model and the Linux distribution. Fibre Channel support is available for
both direct and switched attachment.
Overview of zLinux operations 33
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