Dell PowerVault MD3220 - Manual (Page 54)

54 Planning: MD3200 Series Storage Array Terms and Concepts
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.
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 virtual
disk copy. This configuration is one of the best ways you can apply the
snapshot virtual disk feature, since it enables complete backups without any
impact on the storage array I/O.
You cannot use a snapshot repository virtual disk as a source virtual disk or as
a target virtual disk in a virtual disk copy. If you select the source virtual disk
as the target virtual disk of a virtual disk copy, you must disable all snapshot
virtual disks associated with the source virtual disk.
Multi-Path Software
Multi-path software (also referred to as the failover driver) is a software
resident on the host server that provides management of the redundant data
path between the host server and the storage array.
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