Linux for S/390 (31-bit)
Linux for S/390 is a 31-bit version of Linux. It also runs on zSeries models in 31-bit mode. The
31-bit limitation limits the addressable main storage to 2 GB.
Linux for zSeries (64-bit)
Linux on zSeries supports the 64-bit architecture on all zSeries models. The 64-bit support eliminates
the 31-bit storage limitation of 2 GB.
FCP support
Linux for zSeries can access FCP and FICON/zHPF controllers and devices with the appropriate
I/O driver support. Linux can run using the operating system that came with the system in a logical
partition or as a guest operating system under z/VM Version 4 Release 4 or later. For the most
current list of supported operating system releases, see the IBM website for interoperability
information or contact your HP representative.
A zSeries FCP channel is required to attach storage through a Fibre Channel. An FCP channel
requires the same FICON channel hardware that is used for FICON channel. FICON channel
hardware can be designated as either a FICON or FCP channel by specifying the correct channel
path type (FC or FCP) in the IOCP channel path ID (CHPID statement. The FICON/zHPF requires
a CHPID type FC and uses the FCP link transport. Defining FCP type channels in the IOCP reduces
the total number of FICON type channels that you can configure.
Accessing storage units using FCP protocol from a zSeries host
1. Gather the prerequisite information about the SAN setup. See (page 34) for a list of the
information that you must collect.
2. Set up the storage unit and configure the LUNs for use with Linux for zSeries. See (page 35)
for the steps you must perform to set up the storage unit.
3. Manually load the required modules and parameters to access the disks. See (page 5) for
the steps you must perform to view LUNs and set the Linux system to use FCP devices.
4. Make the disks permanently accessible. See (page 36) for the steps you must perform to add
permanent devices.
Setting up storage units for zSeries hosts running Linux
You must begin by first collecting the following software configuration information to prepare a
Linux system for accessing the storage unit through a Fibre Channel:
• Host name of the server hosting the Linux system.
• Device address and CHPID of the FCP port that is attached to the Linux machine. FICON/zHPF
requires a CHPID type FC.
• WWPN of the FCP port on the zSeries
• WWPN of the Fibre Channel port on the storage unit
• Fibre Channel port on the storage unit
This information can be obtained from the HMC, the IBM TotalStorage DS Storage Manager, and
the SAN switch.
To set up the LUNs for use with your Linux system, you must first define the system to the storage
unit. You can do this through the IBM TotalStorage DS Storage Manager. The following instructions
assume that you are familiar with the IBM TotalStorage DS Storage Manager.
1. Log on to the IBM TotalStorage DS Storage Manager and select Real-time manager > Manage
hardware > Host systems.
2. From the Select Action drop-down list, select Create, then click Go.
34 Linux operations
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