Dell PowerVault MD3220i Owner's Manual - Page 53
Virtual Disk Recovery, Using Snapshot and Disk Copy Together
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Source Virtual Disk When you create a virtual disk copy, a copy pair consisting of a source virtual disk and a target virtual disk is created on the same storage array. When a virtual disk copy is started, data from the source virtual disk is copied completely to the target virtual disk. Target Virtual Disk When you start a virtual disk copy, the target virtual disk maintains a copy of the data from the source virtual disk. You can choose whether to use an existing virtual disk or create a new virtual disk as the target virtual disk. If you choose an existing virtual disk as the target, all data on the target is overwritten. A target virtual disk can be a standard virtual disk or the source virtual disk of a failed or disabled snapshot virtual disk. NOTE: The target virtual disk capacity must be equal to or greater than the source virtual disk capacity. When you begin the disk copy process, you must define the rate at which the copy is completed. Giving the copy process top priority slightly impacts I/O performance, while giving it lowest priority makes the copy process longer to complete. You can modify the copy priority while the disk copy is in progress. For more information, see the online help topics. Virtual Disk Recovery You can use the Edit host server-to-virtual disk mappings feature to recover data from the backup virtual disk. This functionality enables you to unmap the original source virtual disk from its host server, then map the backup virtual disk to the same host server. Ensure that you record the LUN used to provide access to the source virtual disk. You need this information when you define a host server-to-virtual disk mapping for the target (backup) virtual disk. Also, be sure to stop all I/O activity to the source virtual disk before beginning the virtual disk recovery procedure. Using Snapshot and Disk Copy Together You can use the Snapshot Virtual Disk and Virtual Disk Copy premium features together to back up data on the same storage array, or to restore the data on the snapshot virtual disk to its original source virtual disk. Planning: MD3200i Series Storage Array Terms and Concepts 53