You can use the installation disks in rescue mode, in case your system does not boot. Rescue mode gives you access to the disk partitions on your system so you can make any changes necessary to rescue your installation.

To boot in rescue mode on iSeries or i5 with power control NWSD , follow the instructions for booting the installation program, with this change: In the NWSD, set the IPL parameters field to 'rescue' (including the quotes), or to 'dd rescue' if you need to load the SCSI driver. On other systems, specify the rescue or dd rescue (without quotes) after the default kernel name at the YABOOT prompt.

After the Language Selection screen (Section 2.5, “Language Selection”), the installation program attempts to mount the disk partitions on your system. It then presents you with a shell prompt where you can make the changes you need. These changes may include storing the kernel and command line into the IPL source, as described in the Installation Complete section (Section 2.17, “Installation Complete”).

When your changes are complete, you can exit the shell using exit 0. This causes a reboot from the C side. To reboot from the A or B side or from *NWSSTG, you should vary off the system instead of exiting the shell.