Managing Serviceguard 13th Edition, February 2007

Troubleshooting Your Cluster
Replacing Disks
Chapter 8352
NOTE Under agile addressing, the physical device in this example would have a
name such as /dev/disk/disk1. See “About Device File Names (Device
Special Files)” on page 115.
Serviceguard checks the lock disk on an hourly basis. After the
vgcfgrestore command, review the syslog file of an active cluster node
for not more than one hour. Then look for a message showing that the
lock disk is healthy again.
On-line Hardware Maintenance with In-line SCSI
Terminator
In some shared SCSI bus configurations, on-line SCSI disk controller
hardware repairs can be made if HP in-line terminator (ILT) cables are
used. In-line terminator cables are supported with most SCSI-2
Fast-Wide configurations.
In-line terminator cables are supported with Ultra2 SCSI host bus
adapters only when used with the SC10 disk enclosure. This is because
the SC10 operates at slower SCSI bus speeds, which are safe for the use
of ILT cables. In-line terminator cables are not supported for use in any
Ultra160 or Ultra3 SCSI configuration, since the higher SCSI bus speeds
can cause silent data corruption when the ILT cables are used.