VERITAS Volume Manager 3.5 User's Guide - VERITAS Enterprise Administrator (September 2004)

Volume Tasks
Adding a Mirror to a Volume
Chapter 4128
Adding a Mirror to a Volume
The volume Add Mirror procedure creates a mirror (copy) of a volume
on a disk that is not already being used by the volume. If one of the disks
fails, the volume data can be accessed from the surviving disks. A volume
can have multiple mirrors.
• To create a mirror on an existing volume, use the Add Mirror Wizard.
• To create a new mirrored volume, use the Create Volume Wizard.
You select a mirrored layout when you create the volume. See “VxVM
Volumes” on page 105
NOTE The mirroring process is disabled if the volume cannot be mirrored or if
there is no unallocated space on another dynamic disk large enough to
mirror the volume. A RAID-5 volume cannot be mirrored.
To add a mirror to an existing volume
Step 1. Select the volume to be mirrored.
Step 2. Choose Actions > Mirror > Add.
Step 3. Complete the Add Mirror dialog box as follows:
Options: • To add more than one mirror, enter the
number of mirrors in the Mirror Quantity
field.
• To place the mirror on a specific disk, select
Manually select disks for use by
this volume, and assign the destination
disks for the mirrors.
• To specify the layout for the mirror, select
Mirror Across or Stripe Across. For a
striped mirror, specify the number of
columns and stripe unit size.