Using Serviceguard Extension for RAC, 6th Edition, April 2008

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
Online Replacement of a Mechanism in an HA Enclosure Configured with Shared LVM
(SLVM)
If you are using software mirroring for shared concurrent activation of Oracle RAC
data with MirrorDisk/UX and the mirrored disks are mounted in a high availability
disk enclosure use the following LVM command options to change/replace disks via
OLR (On Line Replacement):
NOTE: This procedure supports either LVM or SLVM VG and is “online” (activated),
which uses an “online disk replacement” mechanism. It is supported for SLVM, however
the PV being replaced must be detached from each node. For example, running
pvchange -a N /dev/dsk/… from one node only detaches the disk from that node's
perspective.
1. Detach the target PV by using one of the following commands on each node of the
cluster:
# pvchange -a n [pv path]
Use the pvchange command -a n [pv path] to detach only one path or replace
a disk if the primary path disk path is not performing well and you want to disable
the path. The pvchange -a n command detaches the single specified PV Link
(device path). (If the path was the path in use LVM will switch to any alternate
PV Link that is still available.)
OR
Replacing Disks 159