6Using The Virtual Disk Copy FeatureThis chapter describes how the Virtual Disk Copy feature works, lists the script commands for Virtual DiskCopy, and explains how to use the commands to create and run Virtual Disk Copy. Additional informationabout Virtual Disk Copy and related definitions is available in the online help, the Deployment Guide, theMD Storage Manager online help, and the Administrator's Guide.NOTE: If you ordered Premium Features for Virtual Disk Copy, you received a Premium FeaturesActivation card shipped in the same box as your Dell PowerVault MD storage array. Follow thedirections 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 anothervirtual disk (the target) in a single storage array. You can use this feature to perform the followingfunctions:• Back up data.• Copy data from disk groups that use smaller capacity physical disks to disk groups using largercapacity 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 CopyStarting 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 virtualdisk.If you have data stored on a virtual disk you specify as a virtual disk copy target, make sure you no longerneed the data or have it backed up before beginning virtual disk copy.Virtual Disk Copy TypesThe 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 thecopy is in progress. The source virtual disk will not be available during the copy operation. This iscalled an offline virtual disk copy.• A virtual disk copy using a point-in-time copy of any virtual disk, while still allowing access to thesource 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 copyoperation is in place.77
