Red Hat ENTERPRISE LINUX 3 - FOR IBM S-390 AND IBM ESERVER ZSERIES, Installation Manual

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When Red Hat Enterprise Linux runs in in LPAR, it attempts to acquire information about all
devices granted to the LPAR. This could result in an out-of-memory condition on installations
with a large number of devices. However, this can be avoided with the use of the
cio_ignore
kernel parameter. Setting the
cio_ignore
parameter creates a blacklist and prevents the kernel
from creating data structures for the specified devices.
This parameter can be passed at boot time using the interactive boot menu or made more
persistent by setting the
/etc/zipl.conf
file.
For a complete description of the
cio_ignore
kernel parameter, refer to Chapter 28: Selected
kernel parameters of Device Drivers, Features, and Commands. This document can be
downloaded here:
http://download.boulder.ibm.com/ibmdl/pub/software/dw/linux390/docu/l26bdd03.pdf
6.1. Interactive Setup
At the prompt of the interactive boot menu, enter the number of the requested boot
configuration. 0 is the default configuration. Then, enter the
cio_ignore
parameter in the
following format:
0 cio_ignore=all,!0.0.1300-0.0.1302,!0.0.343d,!0.0.3633
In this example, all devices except 0.0.1300, 0.0.1301, 0.0.1302, 0.0.343d and 0.0.3633 will be
included in the blacklist. For a complete description of the interactive boot menu, refer to
man
zipl.conf
.
Note
Due to an issue with the interactive boot menu on LPAR, use the right square
bracket character (
]
) instead of the exclamation point (
!
).
7. Installing in an LPAR using the Red Hat Enterprise
Linux LPAR CD
The following steps must be taken when installing Red Hat Enterprise Linux onto an LPAR.
• Log in on the Hardware Master Console (HMC) or the Support Element Workplace (SEW) as
a user with sufficient privileges to install a new OS to an LPAR. The SYSPROG user is
recommended.
• Select Images, then select the LPAR to which you wish to install. Use the arrows in the frame
on the right side to navigate to the CPC Recovery menu.
Chapter 1. Steps to Get You Started
12