HP 2000fc Reference Manual page 123

Some guidelines to keep in mind when performing a volume copy include:
The virtual disk selected for the volume copy must be on the same controller.
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The virtual disk selected for the volume copy must have free space that is at least
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as large as the mount of space allocated to the original volume.
A new volume will be created using this free space for the volume copy.
The virtual disk for the volume copy does not need to have the same attributes
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(such as drive type, RAID level) as the volume being copied.
Once the copy is complete, the new volume will no longer have any ties to the
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original.
Volume copy makes a copy from a snapshot, even when requesting the volume
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copy from the master volume; therefore, you need to ensure that you have
sufficient space on the snap pool to store snapshot data when performing this
copy. To ensure sufficient space, you might need to increase the size of the snap
pool. See "Estimating Snap-Pool Size" on page 105 to determine the snap pool
size, and then add an additional amount equal to the average change to the snap
pool size.
Make sure you understand the snap pool thresholds and policies as described in
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"Setting Snap Pool Policies and Thresholds" on page 110. If a snap pool reaches
a critical threshold level, and there is no space left on the snap pool to perform a
volume copy, the system will halt all writes to all master volumes and snapshots
associated with the snap pool, even if the critical policy is to delete all snapshots.
This is because the remaining snapshots using the snap pool space could not be
removed without stopping the action in progress. Stopping a volume copy
operation would result in an incomplete copy of the data.
Chapter 3 Managing Storage 123