Planning: MD3200 Series Storage Array Terms and Concepts 53Virtual Disk CopyVirtual disk copy is a premium feature to:• Back up data• Copy data from disk groups that use smaller-capacity physical disks to diskgroups using greater capacity physical disks• Restore snapshot virtual disk data to the source virtual disk.Virtual disk copy generates a full copy of data from the source virtual disk tothe target virtual disk in a storage array and can be performed either online oroffline.Source Virtual DiskWhen you create a virtual disk copy, a copy pair consisting of a source virtualdisk and a target virtual disk is created on the same storage array. When avirtual disk copy is started, data from the source virtual disk is copiedcompletely to the target virtual disk.Target Virtual DiskWhen you start a virtual disk copy, the target virtual disk maintains a copy ofthe data from the source virtual disk. You can choose whether to use anexisting virtual disk or create a new virtual disk as the target virtual disk. Ifyou choose an existing virtual disk as the target, all data on the target isoverwritten. A target virtual disk can be a standard virtual disk or the sourcevirtual disk of a failed or disabled snapshot virtual disk.NOTE: The target virtual disk capacity must be equal to or greater than the sourcevirtual disk capacity.When you begin the disk copy process, you must define the rate at which thecopy is completed. Giving the copy process top priority slightly impacts I/Operformance, while giving it lowest priority makes the copy process longer tocomplete. You can modify the copy priority while the disk copy is in progress.For more information, see the online help topics.
