Installation guide

Warning
If you receive an error after the Disk Partitioning Setup phase of the installation saying
something similar to:
"The partition table on device dasda was unreadable. To create new partitions it must be
initialized, causing the loss of ALL DATA on this drive."
you may not have a partition table on that drive or the partition table on the drive may not be
recognizable by the partitioning software used in the installation program.
No matter what type of installation you are performing, backups of the existing data on your
systems should always be made.
Important — multipath devices
To install Red Hat Enterprise Linux on a network device accessible through multiple paths,
deselect all local storage in the Select the drive(s) to use for this
installation window, and select a device labeled mapper/mpath instead.
Note that migrating the root file system of an existing Red Hat Enterprise Linux installation from
single path storage to multipath storage is not supported. You must perform a new installation
to move the root file system to a multipath storage device. Therefore you should plan your
installation accordingly. See https://access.redhat.com/site/solutions/66501 for more
information.
17.12. Advanced St orage Opt ions
17.12.1. FCP Devices
FCP (Fibre Channel protocol) devices enable IBM System z to use SCSI devices rather than DASD
devices. FCP (Fibre Channel protocol) devices provide a switched fabric topology that enables zSeries
systems to use SCSI LUNs as disk devices in addition to traditional DASD devices.
Typically, an operating system is loaded, and the automatic probing and defining of hardware is
done by the OS. However, because of the flexibility of configurations associated with FCP, IBM
System z requires that any FCP (Fibre Channel protocol) device be entered manually (either in the
installation program interactively, or specified as unique parameter entries in the CMS conf file) in
order for the installation program to recognize the hardware. The values entered here are unique to
each site in which they are setup.
Note
Interactive creation of a zFCP device is only possible in the graphical mode installer. It is not
possible to interactively configure a zFCP device in a text-only install.
Each value entered should be verified as correct, as any mistakes made may cause the system not to
operate properly.
⁠Chapt er 1 7 . Inst alling on IBM Syst em z Syst ems
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