System Boot Problems
Troubleshooting ftServer Systems
9-3
N O T E
If a RAID array fails to start, the boot stops and enters a
debug shell. This is almost always because of a
configuration error in
/etc/fstab
or
/etc/mdadm.conf
. Exiting the shell forces a reboot.
Depending on your system’s RAID configuration, you may see one or more error
messages similar to the following:
md: could not bd_claim sdar1
md: error, md_import_device() returned -16
These messages indicate that md is refusing to start an array that has already been
started. You can safely ignore them.
The recommended configuration has all RAID-1 arrays marked as type 0xfd (Linux
RAID autodetect) so they start early, and all RAID-0 arrays in
/etc/mdadm.conf
,
so they start later.
•
The operating system checks the file systems.
N O T E
In the case of crash recovery, the file check (
fsck
) may
take a long time, and it may fail. If it fails, the boot stops
and enters a debug shell. The administrator must
manually repair the problem file systems. Exiting the shell
forces a reboot.
Possible Boot Problems
A problem in booting the system may be associated with missing or corrupt
fault-tolerant drivers, the GRUB boot loader, or RAID.
Missing Drivers Prevent Booting
If required fault-tolerant drivers are not present at boot time, and if the system’s
fault-tolerant policy is set to prevent booting when drivers are missing (the default
setting), the following prompt appears at the console:
This system is not fault tolerant because
reason
Type "NON-FT-BOOT" to allow login for repair:
