Chapter 33. Planning for installation on IBM Z
Red Hat Enterprise Linux 8 runs on z13 or later IBM mainframe systems.
The installation process assumes that you are familiar with the IBM Z and can set up logical partitions (LPARs) and z/VM guest virtual machines.
For installation of Red Hat Enterprise Linux on IBM Z, Red Hat supports Direct Access Storage Device (DASD) and Fiber Channel Protocol (FCP) storage devices.
DASDs are hard disks that allow a maximum of three partitions per device. For example,
dasda can have partitions
- Whether the operating system is to be run on an LPAR or as a z/VM guest operating system.
- If swap space is needed, and how much. Although it is recommended to assign enough memory to a z/VM guest virtual machine and let z/VM do the necessary swapping, there are cases where the amount of required RAM is hard to predict. Such instances should be examined on a case-by-case basis.
Network configuration. Red Hat Enterprise Linux 8 for IBM Z supports the following network devices:
- Real and virtual Open Systems Adapter (OSA)
- Real and virtual HiperSockets
- LAN channel station (LCS) for real OSA
You will need to calculate and allocate sufficient disk space on DASDs or SCSI disks.
- A minimum of 10 GB is needed for a server installation, 20 GB if you want to install all packages.
- Disk space is also required for any application data. After the installation, you can add or delete more DASD or SCSI disk partitions.
- The disk space used by the newly installed Red Hat Enterprise Linux system (the Linux instance) must be separate from the disk space used by other operating systems you have installed on your system.
You will have to ensure enough RAM is available.
- 1 GB is recommended for the Linux instance. With some tuning, an instance might run with as little as 512 MB RAM.
- If installing from NFS, 1 GB is sufficient. However, if installing from an HTTP or FTP source, 1.5 GB is needed.
- Running at 512 MB in text mode can be done only when installing from NFS.
When initializing swap space on a Fixed Block Architecture (FBA) DASD using the SWAPGEN utility, the
FBAPART option must be used.
- For additional information on IBM Z, see http://www.ibm.com/systems/z.