Dell PowerVault MD3260i - Manual (Page 75)

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Using The Virtual Disk Copy Feature
This chapter describes how the Virtual Disk Copy feature works, lists the script commands for Virtual Disk Copy, and
explains how to use the commands to create and run Virtual Disk Copy. Additional information about Virtual Disk Copy
and related definitions is available in the online help, the
Deployment Guide , the MD Storage Manager online help , and
the Administrator's Guide .
NOTE: If you ordered Premium Features for Virtual Disk Copy, you received a Premium Features Activation card
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. For more information, see "Premium Feature — Virtual Disk Copy" in the Owner's
Manual .
The Virtual Disk Copy feature enables you to copy data from one virtual disk (the source) to another virtual disk (the
target) in a single storage array. You can use this feature to perform the following functions:
• Back up data.
• Copy data from disk groups that use smaller capacity physical disks to disk groups using larger capacity
physical disks.
• Restore snapshot virtual disk data to the associated source virtual disk.
• Copy data from a thin virtual disk to a standard virtual disk on the same storage array.
NOTE: You cannot copy data from a standard virtual disk to a thin virtual disk.
About Virtual Disk Copy
Starting a virtual disk copy operation does the following to your target copy disks:
• Overwrites all existing data on the target virtual disk.
• Makes the target virtual disk read-only to hosts.
• Fails all snapshot (legacy) virtual disks or snapshot image virtual disks associated with the target virtual disk.
If you have data stored on a virtual disk you specify as a virtual disk copy target, make sure you no longer need the data
or have it backed up before beginning virtual disk copy.
Virtual Disk Copy Types
The Virtual Disk Copy script commands create one of following types of virtual disk copies:
• A virtual disk copy using a snapshot (legacy), which suspends I/O to the source virtual disk while the copy is in
progress. The source virtual disk will not be available during the copy operation. This is called an offline virtual
disk copy.
• A virtual disk copy using a point-in-time copy of any virtual disk, while still allowing access to the source virtual
disk when the copy is in progress. This is called an online virtual disk copy.
In either type of virtual disk copy, the target virtual disk is locked and cannot be accessed while the copy operation is in
place.
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