54 Planning: MD3200i Series Storage Array Terms and ConceptsVirtual Disk RecoveryYou can use the Edit host server-to-virtual disk mappings feature to recoverdata from the backup virtual disk. This functionality enables you to unmapthe original source virtual disk from its host server, then map the backupvirtual disk to the same host server.Ensure that you record the LUN used to provide access to the source virtualdisk. You need this information when you define a host server-to-virtual diskmapping for the target (backup) virtual disk. Also, be sure to stop all I/Oactivity to the source virtual disk before beginning the virtual disk recoveryprocedure.Using Snapshot and Disk Copy TogetherYou can use the Snapshot Virtual Disk and Virtual Disk Copy premiumfeatures together to back up data on the same storage array, or to restore thedata on the snapshot virtual disk to its original source virtual disk.You can copy data from a virtual disk by:• Taking a point-in-time snapshot of the data (online)• Copying the data to another virtual disk using a virtual disk copy (offline)You can select a snapshot virtual disk as the source virtual disk for a virtualdisk copy. This configuration is one of the best ways you can apply thesnapshot virtual disk feature, since it enables complete backups without anyimpact on the storage array I/O.You cannot use a snapshot repository virtual disk as a source virtual disk or asa target virtual disk in a virtual disk copy. If you select the source virtual diskas the target virtual disk of a virtual disk copy, you must disable all snapshotvirtual disks associated with the source virtual disk.Multi-Path SoftwareMulti-path software (also referred to as the failover driver) is a softwareresident on the host server that provides management of the redundant datapath between the host server and the storage array. For the multi-pathsoftware to correctly manage a redundant path, the configuration must haveredundant iSCSI connections and cabling.
