Administrator Guide

Step 4: Connectivity is Restored to the Source Site
When the outage at the source site is corrected, Storage Manager Data Collector regains connectivity to the source Storage Center.
The replication cannot be restarted at this time because the destination volume contains newer data than the original source volume.
Figure 85. Replication After the Source Site Comes Back Online
1. Source volume 2. Replication over Fibre Channel or iSCSI (down)
3. Destination volume (activated) 4. Server mapping to source volume (may be up or down)
5. Server mapping to activated DR volume 6. Server at source site (may be up or down)
7. Server at DR site
Step 5: An Administrator Restores the Source Volume
After verifying that the source site is back up and fully functional, an administrator begins the process of restoring the original source
volume based on the activated DR volume. Administrator intervention is required during the restore process to make sure that IO is
halted to the destination volume at the appropriate time.
Step 5A: The Destination Volume Replicates Back to the Source Site
When the restore operation is initiated, the activated destination begins replicating to the original source volume. The most recent
common snapshot for the original source and activated DR volume is located, and subsequent snapshots are replicated to the
original source volume. If all common snapshots expired after the destination volume was activated for DR, a new volume is created
and the original is placed in the recycle bin so that it can be retrieved if necessary. During this time, the activated DR volume
continues to accept IO.
Figure 86. Activated DR Volume Replicating Back to the Source Site
1.
Source volume being recovered 2. Replication over Fibre Channel or iSCSI
3. Destination volume (activated) 4. Server mapping to activated DR volume
5. Server at source site (not mapped) 6. Server at DR site
Storage Center DR Preparation and Activation
711