Using Serviceguard Extension for RAC, 4th Edition, February 2007

Maintenance and Troubleshooting
Replacing Disks
Chapter 4204
Replacing a Mechanism in an HA Enclosure
Configured with Exclusive LVM
Non-Oracle data that is used by packages may be configured in volume
groups that use exclusive (one-node-at-a-time) activation. If you are
using exclusive activation and software mirroring with MirrorDisk/UX
and the mirrored disks are mounted in a high availability disk enclosure,
you can use the following steps to hot plug a disk mechanism:
1. Identify the physical volume name of the failed disk and the name of
the volume group in which it was configured. In the following
examples, the volume group name is shown as /dev/vg_sg01 and
the physical volume name is shown as /dev/c2t3d0. Substitute the
volume group and physical volume names that are correct for your
system.
2. Identify the names of any logical volumes that have extents defined
on the failed physical volume.
3. On the node on which the volume group is currently activated, use
the following command for each logical volume that has extents on the
failed physical volume:
# lvreduce -m 0 /dev/vg_sg01/lvolname /dev/dsk/c2t3d0
4. At this point, remove the failed disk and insert a new one. The new
disk will have the same HP-UX device name as the old one.
5. On the node from which you issued the lvreduce command, issue
the following command to restore the volume group configuration
data to the newly inserted disk:
# vgcfgrestore /dev/vg_sg01 /dev/dsk/c2t3d0
6. Issue the following command to extend the logical volume to the
newly inserted disk:
# lvextend -m 1 /dev/vg_sg01 /dev/dsk/c2t3d0
7. Finally, use the lvsync command for each logical volume that has
extents on the failed physical volume. This synchronizes the extents
of the new disk with the extents of the other mirror.
# lvsync /dev/vg_sg01/lvolname