Configuration: Premium Feature—Virtual Disk Copy 173
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Configuration: Premium Feature—
Virtual Disk Copy
NOTE: A virtual disk copy overwrites data on the target virtual disk. Before starting
a virtual disk copy, ensure that you no longer need the data or back up the data on
the target virtual disk.
NOTE: If you ordered this feature, you received a Premium Feature Activation card
that shipped in the same box as your Dell PowerVault MD storage array. Follow the
directions on the card to obtain a key file and to enable the feature.
NOTE: The preferred method for creating a virtual disk copy is to copy from a
snapshot virtual disk. This allows the original virtual disk used in the snapshot
operation to remain fully available for read/write activity while the snapshot is used
as the source for the virtual disk copy operation.
When you create a virtual disk copy, you create a copy pair that has a source
virtual disk and a target virtual disk on the same storage array.
The source virtual disk is the virtual disk that contains the data you want to
copy. The source virtual disk accepts the host I/O read activity and stores the
data until it is copied to the target virtual disk. The source virtual disk can be
a standard virtual disk, a snapshot virtual disk, or the source virtual disk of a
snapshot virtual disk. When you start a virtual disk copy, all data is copied to
the target virtual disk, and the source virtual disk permissions are set to read-
only until the virtual disk copy is complete.
The target virtual disk is a virtual disk to which you copy data from the source
virtual disk. The target virtual disk can be a standard virtual disk, or the
source virtual disk of a failed or disabled snapshot virtual disk.
After the virtual disk copy is complete, the source virtual disk becomes
available to host applications for write requests. To prevent error messages, do
not attempt to access a source virtual disk that is participating in a virtual disk
copy while the virtual disk copy is in progress.
Reasons to use virtual disk copy include:
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