Using Serviceguard Extension for RAC, 3rd Edition, May 2006

Maintenance and Troubleshooting
Replacing Disks
Chapter 4198
This will synchronize the stale logical volume mirrors. This step can
be time-consuming, depending on hardware characteristics and the
amount of data.
6. Deactivate the volume group:
# vgchange -a n vg_ops
7. Activate the volume group on all the nodes in shared mode using
vgchange - a s:
# vgchange -a s vg_ops
Replacing a Lock Disk
Replacing a failed lock disk mechanism is the same as replacing a data
disk. If you are using a dedicated lock disk (one with no user data on it),
then you need to issue only one LVM command:
# vgcfgrestore /dev/vg_lock /dev/dsk/c2t1d0
After doing this, wait at least an hour, then review the syslog file for a
message showing that the lock disk is healthy again.
On-line Hardware Maintenance with In-line SCSI
Terminator
Serviceguard allows on-line SCSI disk controller hardware repairs to all
cluster nodes if you use HP’s in-line terminator (C2980A) on nodes
connected to the end of the shared FW/SCSI bus. The in-line terminator
cable is a 0.5 meter extension cable with the terminator on the male end,
which connects to the controller card for an external bus. The in-line
terminator is used instead of the termination pack that is attached to the
controller card and makes it possible to physically disconnect the node
from the end of the F/W SCSI bus without breaking the bus's
termination. (Nodes attached to the middle of a bus using a Y cable also
can be detached from the bus without harm.) When using in-line
terminators and Y cables, ensure that all orange-socketed termination
packs are removed from the controller cards.