Chapter 5. FCP for zSeries with Linux 53
http://www.storage.ibm.com/disk/ess/whitepaper.htm
5.2.1 Hardware and software requirements
The hardware and software features required for zSeries FCP function for Linux are
described in the Redpaper
Getting Started with zSeries Fibre Channel Protocol,
REDP0205.
We provide an overview here.
zSeries FCP channels require a FICON card (feature 2315 or 2318), or a FICON Express
card (feature 2319 or 2320). The type of firmware to be loaded into the FICON/FICON
Express card, turning it into either an FCP channel or a FICON channel, is controlled by the
definition of the channel type for that particular channel in the IOCP (the CHPID statement).
Thus, by defining FCP type channels in the IOCP, the total number of FICON type channels
that can be configured is reduced accordingly.
The Linux for zSeries distribution required for FCP support is SLES8. FCP and SCSI
controllers and devices can be accessed by Linux for zSeries with the appropriate I/O driver.
Linux may run either natively in a logical partition, or as a guest operating system under z/VM.
5.2.2 An implementation overview
As mentioned earlier, the redbook I
mplementing Linux with IBM Disk Storage
,
SG24-6261-01, describes an implementation of SuSE Linux (SLES8) on zSeries (both as a
z/VM guest and also running natively in an LPAR), and the FCP attachment of an ESS Model
800 to these systems. We will briefly overview the ESS Specialist activities involved in that
implementation; for further details, such as the specific hardware/software used, the steps to
perform the installation of SuSE, the Linux host setup tasks, and so on, refer to the redbook.
The ESS Specialist activities in this implementation involved defining a Linux on zSeries host,
configuring ESS host adapters, configuring RAID arrays, and allocating storage, all using the
ESS Specialist.
ESS Specialist
We have introduced the ESS Specialist in 4.3.3, “ESS Specialist” on page 44. Using your
Web browser you first display the welcome screen shown in Figure 4-7 on page 45 and then
click the
ESS Specialist button to display the ESS Specialist main screen. From there
clicking the
Storage Allocation button enables you to set up and view the storage
segmentation in your ESS, as shown in Figure 5-6.
Note: The z/VM Version 4, Release 3 is required to support FCP for Linux guests.
However, z/VM itself does not support FCP devices, it supports FCP to the extent of
passing it through to guest systems.
Linux on zSeries cannot boot (or Initial Program Load (IPL)) from FCP attached disk.
Hence, a certain amount of CKD disk is required for Linux on zSeries to hold the operating
system.
54 Linux with zSeries and ESS - Essentials
Figure 5-6 Storage Allocation panel
Since we are attaching Fibre Channel disk (fixed-block FB format) to Linux on zSeries, we
chose the
Open Systems Storage button this time, and the panel shown in Figure 5-7 now
appears.
Figure 5-7 Open Systems Storage panel
We then perform the configuration actions described below by clicking the respective buttons
at the bottom of the Open Systems Storage panel.

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