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

# pvchange -a N [pv path]
Alternatively, use the pvchange -a N [pv path] command to detach a disk
(all paths to the disk) and close it. Use this to allow diagnostics or replace a
multi-ported disk.
NOTE: If the volume group is mirrored, applications can continue accessing data
on mirror copies after the commands above. If the volume is not mirrored, then
any access attempts to the device may hang indefinitely or time out. This depends
upon the LV timeout value configured for the logical volume.
2. Replace new disk.
The new disk size needs to be of equal or greater size. This is required whether or
not the disk replacement is online or offline.
3. Restore the LVM header to the new disk using the following command:
# vgcfgrestore -n [vg name] [pv raw path]
It is only necessary to perform the vgcfgrestore operation once from any node
on the cluster.
4. Attach PV or Activate the VG from each node of the cluster using the following
commands:
#pvchange -a y [pv path]
OR
# vgchange -a [y|e|s] [vg name]
The PV must be detached from all nodes and much be attached from each of the
nodes to make it usable. Alternatively, you can re-activate the VG from each of
the nodes. (This command cannot attach all the paths to the PV, therefore each PV
link has to be attached as well.)
NOTE: After executing one of the commands above, any I/O queued for the
device will restart. If the device replaced in step #2 was a mirror copy, then it will
begin the resynchronization process, which may take a significant amount of time
to complete. The progress of the resynchronization process can be observed using
the vgdisplay(1M), lvdisplay(1M) or pvdisplay(1M) commands.
Offline Replacement of a Mechanism in an HA Enclosure Configured with Shared LVM
(SLVM)
Hot plugging of disks is not supported for Oracle RAC data, which is configured in
volume groups with Shared LVM (SLVM). If you need this capability, you should use
disk arrays for your Oracle RAC data.
160 Maintenance and Troubleshooting