Managing Serviceguard 13th Edition, February 2007

Troubleshooting Your Cluster
Replacing Disks
Chapter 8350
Replacing Disks
The procedure for replacing a faulty disk mechanism depends on the type
of disk configuration you are using. Separate descriptions are provided
for replacing an array mechanism and a disk in a high availability
enclosure.
For more information, see the section Replacing a Bad Disk in the
Logical Volume Management volume of the HP-UX System
Administrator’s Guide, at http://docs.hp.com
Replacing a Faulty Array Mechanism
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 or VxVM activity is
needed. This process is known as hot swapping the disk.
Replacing a Faulty Mechanism in an HA Enclosure
If you are using 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
example, the volume group name is shown as /dev/vg_sg01 and the
physical volume name is shown as /dev/dsk/c2t3d0. Substitute the
volume group and physical volume names that are correct for your
system.
NOTE This example assumes you are using legacy DSF naming. Under
agile addressing, the physical volume would have a name such as
/dev/disk/disk1. See “About Device File Names (Device Special
Files)” on page 115.
If you need to replace a disk under the 11i v3 agile addressing
scheme, and the new disk belongs to the same class as the old, you
may be able to reduce downtime by using the io_redirect_dsf(1M)