Sun Microsystems StorageTek 6140 Administration Manual page 80

Select a target volume from the list of target volume candidates.
The target volume must have a capacity that is equal to or greater than the usable
capacity of the source volume. A target volume must be one of the following:
Caution: A volume copy will overwrite all data on the target volume and
automatically make the target volume read-only to hosts. Ensure that you no
longer need the data or have backed up the data on the target volume before
starting a volume copy. After the volume copy process has finished, you can
enable hosts to write to the target volume by changing the target volume's Read-
Only attribute on the Volume Details page.
Because a target volume can have only one source volume, it can participate in
one copy pair as a target. However, a target volume can also be a source volume
for another volume copy, enabling you to make a volume copy of a volume copy.
Set the copy priority for the volume copy.
During a volume copy, the storage array's resources may be diverted from
processing I/O activity to completing a volume copy, which may affect the
storage array's overall performance.
Several factors contribute to the storage array's performance, including I/O
activity, volume redundant array of independent disks (RAID) level, volume
configuration (number of drives and cache parameters), and volume type
(volume snapshots may take more time to copy than standard volumes).
When you create a new volume copy, you will define the copy priority to
determine how much controller processing time is allocated for the volume copy
process and diverted from I/O activity.
There are five relative priority settings. The Highest priority rate supports the
volume copy at the expense of I/O activity. The Lowest priority rate supports I/O
activity at the expense of volume copy speed.
You can specify the copy priority before the volume copy process begins, while it
is in progress, or after it has finished (in preparation for recopying the volume).
64 Sun StorageTek Array Administration Guide • May 2006
Standard volume
Base volume of a Failed or Disabled volume snapshot.
Note: In order for a volume to be used as a target volume, its snapshots need
to be either failed or disabled.