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HP Hitachi Dynamic Link Manager Software User Manual

Page 372

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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