IBM HANDBOOK 260 - Manual (Page 256)

238 RS/6000 43P 7043 Models 150 and 260 Handbook
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8.7 Booting Problems
After the firmware has passed control of the system to AIX, problems which
occur are, in most cases, the same as for any other RS/6000. In this section,
several problems during booting are discussed.
8.7.1 Booting from CD-ROM
While AIX supports installation from external CD-ROM, the CD-ROM drives,
7210-001 and 7210-010, cannot be used as a boot device.
8.7.2 System Hangs during AIX Boot Process
The AIX booting process on the PCI-based RS/6000 is similar to the Micro
Channel-based RS/6000 systems. This means that the boot process can be
monitored by the LEDs. If the system hangs, you will have to perform system
maintenance and try to determine the cause of the problem by using the
standard AIX LED recovery procedures. Typically, the procedure to follow is:
1. Boot the system into Maintenance mode by using either a CD-ROM or
bootable tape.(if your are booting from a tape make sure that the
PROMPT stanza in the bosinst.data is set to YES. Otherwise, a mksysb
restore will occur, unless interrupted as described in 8.3.5.3, “How to
Interrupt a Non-prompted Installation” on page 226.
2. Select the option to access the root volume group and start a shell before
the file systems are mounted.
3. Check the root volume group file systems:
fsck -y /dev/hd1
fsck -y /dev/hd2
fsck -y /dev/hd3
fsck -y /dev/hd4
fsck -y /dev/hd9var
4. Format the Journaled File System (JFS) log:
logform /dev/hd8
Answer YES when asked if you want to destroy the log.
5. Type exit to mount the root file systems.
6. Check the inittab file for any entries which may be causing problems.
7. Check for any full file systems (particularly /, /tmp, /var and /usr).