52 Planning: MD3200i Series Storage Array Terms and ConceptsSnapshot Repository Virtual DiskWhen you create a snapshot virtual disk, it automatically creates a snapshotrepository virtual disk. A snapshot repository is a virtual disk created in thestorage array as a resource for a snapshot virtual disk. A snapshot repositoryvirtual disk contains snapshot virtual disk metadata and copy-on-write datafor a particular snapshot virtual disk. The repository supports one snapshotonly.You cannot select a snapshot repository virtual disk as a source virtual disk oras a target virtual disk in a virtual disk copy. If you select a Snapshot sourcevirtual disk as the target virtual disk of a virtual disk copy, you must disable allsnapshot virtual disks associated with the source virtual disk.CAUTION: Before using the Snapshot Virtual Disks Premium Feature in aWindows® Clustered configuration, you must map the snapshot virtual disk to thecluster node that owns the source virtual disk. This ensures that the cluster nodescorrectly recognize the snapshot virtual disk.Mapping the snapshot virtual disk to the node that does not own the sourcevirtual disk before the snapshot enabling process is completed can result inthe operating system misidentifying the snapshot virtual disk. This can resultin data loss or an inaccessible snapshot.For details on mapping the snapshot virtual disk to the secondary node, referto the Dell™ PowerVault™ MD3200i and MD3220i Storage Arrays WithMicrosoft® Windows Server® Failover Clusters on support.dell.com/manuals.Virtual Disk CopyVirtual disk copy is a premium feature you can use 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.
