VERITAS Volume Manager 3.1 Administrator's Guide

Volume Tasks
Performing Online Backup
Chapter 6 291
Mirroring Volumes on a VM Disk
Mirroring the volumes on a VM disk gives you one or more copies of your
volumes in another disk location. By creating mirror copies of your
volumes, you protect your system against loss of data in case of a disk
failure. You can use this task on your root disk to make a second copy of
the boot information available on an alternate disk. This allows you to
boot your system even if your root disk is corrupted.
NOTE This task only mirrors concatenated volumes. Volumes that are already
mirrored or that contain subdisks that reside on multiple disks are
ignored.
To mirror volumes on a disk, make sure that the target disk has an equal
or greater amount of space as the originating disk and then do the
following:
Step 1. Select menu item 6 (Mirror volumes on a disk) from the
vxdiskadm main menu.
Step 2. At the following prompt, enter the disk name of the disk that you wish to
mirror:
Mirror volumes on a disk
Menu: VolumeManager/Disk/Mirror
This operation can be used to mirror volumes on a disk.
These
volumes can be mirrored onto another disk or onto any
available disk space. Volumes will not be mirrored if
they are
already mirrored. Also, volumes that are comprised of
more than
one subdisk will not be mirrored.
Mirroring volumes from the boot disk will produce a disk
that
can be used as an alternate boot disk.
Enter disk name [<disk>,list,q,?] disk02
Step 3. At the following prompt, enter the target disk name (this disk must be
the same size or larger than the originating disk):