Ibm S/390 And Ibm System Z Systems; Ibm Eserver Iseries Systems; Ibm Eserver Pseries Systems - Red Hat ENTERPRISE LINUX 5 - DEPLOYMENT Deployment Manual

Chapter 40. Manually Upgrading the Kernel

40.6.3. IBM S/390 and IBM System z Systems

The IBM S/390 and IBM System z systems use z/IPL as the boot loader, which uses /etc/
zipl.conf as the configuration file. Confirm that the file contains a section with the same version as
the kernel package just installed:
[defaultboot] default=old target=/boot/
[linux]
image=/boot/vmlinuz-2.6.9-5.EL
ramdisk=/boot/initrd-2.6.9-5.EL.img
parameters="root=LABEL=/"
[old]
image=/boot/vmlinuz-2.6.9-1.906_EL
ramdisk=/boot/initrd-2.6.9-1.906_EL.img
parameters="root=LABEL=/"
Notice that the default is not set to the new kernel. To configure z/IPL to boot the new kernel by
default, change the value of the default variable to the name of the section that contains the new
kernel. The first line of each section contains the name in brackets.
After modifying the configuration file, run /sbin/zipl as root to enable the changes.
Begin testing the new kernel by rebooting the computer and watching the messages to ensure that the
hardware is detected properly.

40.6.4. IBM eServer iSeries Systems

The /boot/vmlinitrd-<kernel-version> file is installed when you upgrade the kernel.
However, you must use the dd command to configure the system to boot the new kernel:
1. As root, issue the command cat /proc/iSeries/mf/side to determine the default side
(either A, B, or C).
2. As root, issue the following command, where <kernel-version> is the version of the new
kernel and <side> is the side from the previous command:
dd if=/boot/vmlinitrd-<kernel-version> of=/proc/iSeries/mf/<side>/
vmlinux bs=8k
Begin testing the new kernel by rebooting the computer and watching the messages to ensure that the
hardware is detected properly.

40.6.5. IBM eServer pSeries Systems

IBM eServer pSeries systems use YABOOT as the boot loader, which uses /etc/aboot.conf as
the configuration file. Confirm that the file contains an image section with the same version as the
kernel package just installed:
boot=/dev/sda1 init-message=Welcome to Red Hat Enterprise Linux! Hit <TAB> for boot options
partition=2 timeout=30 install=/usr/lib/yaboot/yaboot delay=10 nonvram
image=/vmlinux--2.6.9-5.EL
label=old
read-only
initrd=/initrd--2.6.9-5.EL.img
append="root=LABEL=/"
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