HP Hitachi Dynamic Link Manager Software - Manual (Page 372)

5. Troubleshooting
350
5.4 Actions to Take for a Path Error in a Boot Disk Environment
This section describes the action to take if an error occurs in a boot disk environment
on a path connecting to the boot disk.
5.4.1 Path Errors During Boot Processing
The procedure for investigating the cause of an error, and the appropriate action to
take, will differ according to the stage of the boot processing during which the path
error occurred. The following describes error investigation methods at each stage of
boot processing.
(1) When a Path Error Occurs at the Initial Stage of Boot Processing
The initial stage of boot processing is the period before the
root
file system's mount
device (one of the paths to the boot disk) specified as the boot device in the OBP is
switched (remounted) to the device specified in the
rootdev
parameter. At this stage,
accessing the boot disk does not involve the HDLM driver: The boot disk is accessed
via the path specified as the boot device in the OBP. If an error occurs on this path at
this stage, boot processing will be cancelled. In this case, investigate the error and take
appropriate action, referring to the following information:
• The message output to the console by the OBP
• The message output to the console by Solaris
• The message output to the console by the HBA driver
In Solaris 8 or Solaris 9, if an error occurs only on the path specified as the boot device
in the OBP, you can boot the system by specifying, in the OBP, a boot device name
with a different path. In Solaris 10, reboot after recovering from the path error.
(2) When a Path Error Occurs After the HDLM Driver Starts Path Processing
At completion of the initial stage of boot processing, the HDLM driver starts accessing
the boot disk using multiple paths. If a path error occurs at this stage, recovery action
will depend on whether or not the HDLM manager has started.
When a path error occurs before the HDLM manager starts
If boot processing is cancelled due to errors on all paths to the boot disk
HDLM does not output the KAPL08022-E message on detection of a path
error. Investigate the error and take appropriate action, referring to the
following information:
• The message output to the console by Solaris
• The message output to the console by the HBA driver