Administrator Guide

Storage Center DR Preparation and Activation
How Disaster Recovery Works
Disaster recovery (DR) is the process activating a replicated destination volume when the source site fails. When the source site comes
back online, the source volume can be restored based on the volume at the DR site.
The following diagrams illustrate each step in the DR process. Although this example shows a replication, DR can also be used for a Live
Volume.
Step 1: A Volume is Replicated to a DR Site
A volume is protected from disaster by replicating it to a Storage Center located at a DR site.
Figure 55. Volume Replicating to a DR Site
1.
Source volume 2. Replication over Fibre Channel or iSCSI
3. Destination volume 4. Server mapping to source volume
5. Server mapped to the source volume
Step 2: The Source Site Goes Down
When the source site goes down, the data on the source volume can no longer be accessed directly. However, the data has been
replicated to the destination volume.
Figure 56. Replication When the Source Site Goes Down
1.
Source volume (down) 2. Replication over Fibre Channel or iSCSI (down)
3. Destination volume 4. Server mapping to source volume (down)
5. Server mapped to the source volume (down)
15
Storage Center DR Preparation and Activation 511