Dell PowerVault MD3000i Hardware Owner's Manual - Page 48

Using Snapshot and Disk Copy Together, Hardware Redundancy and Failover

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You can find more details on using the virtual disk copy feature in the MD Storage Manager User's Guide. 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 will 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 in one of two ways: • By taking a point-in-time snapshot of the data • By copying the data to another virtual disk using a virtual disk copy 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 to the storage array I/O. You cannot, however, 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. Hardware Redundancy and Failover This section provides basic information on how to connect a host server to the RAID controller modules in a RAID enclosure in order to achieve redundancy and failover. 48 Using Your RAID Enclosure

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48
Using Your RAID Enclosure
You can find more details on using the virtual disk copy feature in the
MD
Storage Manager
User’s Guide
.
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 will 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 in one of two ways:
•
By taking a point-in-time snapshot of the data
•
By copying the data to another virtual disk using a virtual disk copy
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 to the storage array I/O.
You cannot, however, 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.
Hardware Redundancy and Failover
This section provides basic information on how to connect a host server to
the RAID controller modules in a RAID enclosure in order to achieve
redundancy and failover.