Administrator Guide

Step 3: An Administrator Activates Disaster Recovery

An administrator activates DR to make the data in the destination volume accessible. When DR is activated, Storage Manager brings the

destination volume on line and maps it to a server at the DR site. The server sends IO to the activated DR volume for the duration of the

source site outage.

Figure 57. Replication When DR is Activated

1. Source volume (down) 2. Replication over Fibre Channel or iSCSI (down)

3. Destination volume (activated) 4. Server mapping to source volume (down)

5. Server mapping to activated DR volume 6. Server at source site

7. Server at DR site

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 58. Replication After the Source Site Comes Back Online

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

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Storage Center DR Preparation and Activation