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

NOTE: As you add new disks to the system, update the planning worksheets
(described in Appendix B: “Blank Planning Worksheets”, so as to record the exact
configuration you are using.
Replacing Disks
The procedure for replacing a faulty disk mechanism depends on the type of disk
configuration you are using and on the type of Volume Manager software. For a
description of replacement procedures using VERITAS VxVM or CVM, refer to the
chapter on “Administering Hot-Relocation” in the VERITAS Volume Manager
Administrator’s Guide. Additional information is found in the VERITAS Volume Manager
Troubleshooting Guide.
The following paragraphs describe how to replace disks that are configured with LVM.
Separate descriptions are provided for replacing a disk in an array and replacing a disk
in a high availability enclosure.
For more information, see When Good Disks Go Bad, posted at http://docs.hp.com
Replacing a Mechanism in a Disk Array Configured with LVM
With any HA disk array configured in RAID 1 or RAID 5, refer to the array’s
documentation for instruction on how to replace a faulty mechanism. After the
replacement, the device itself automatically rebuilds the missing data on the new disk.
No LVM activity is needed. This process is known as hot swapping the disk.
NOTE: If your LVM installation requires online replacement of disk mechanisms, the
use of disk arrays may be required, because software mirroring of JBODs with
MirrorDisk/UX does not permit hot swapping for disks that are activated in shared
mode.
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.
158 Maintenance and Troubleshooting