Managing HP Serviceguard for Linux, Eighth Edition, March 2008

Troubleshooting Your Cluster
Replacing Disks
Chapter 8 303
Replacing Disks
The procedure for replacing a faulty disk mechanism depends on the type
of disk configuration you are using. Refer to your Smart Array
documentation for issues related to your Smart Array.
Replacing a Faulty Mechanism in a Disk Array
You can replace a failed disk mechanism by simply removing it from the
array and replacing it with a new mechanism of the same type. The
resynchronization is handled by the array itself. There may be some
impact on disk performance until the resynchronization is complete. For
details on the process of hot plugging disk mechanisms, refer to your disk
array documentation.
Replacing a Lock LUN
You can replace an unusable lock LUN while the cluster is running,
provided you do not change the devicefile name.
IMPORTANT If you need to use a different devicefile, you must halt the cluster and
change the name of the devicefile in the cluster configuration file; see
“Updating the Cluster Lock LUN Configuration Offline” on page 266.
CAUTION Before you start, make sure that all nodes have logged a message such as
the following in syslog:
WARNING: Cluster lock LUN /dev/sda1 is corrupt: bad label.
Until this situation is corrected, a single failure could
cause all nodes in the cluster to crash.
Once all nodes have logged this message, use a command such as the
following to specify the new cluster lock LUN:
cmdisklock reset /dev/sda1