Administrator Guide
2. The primary Storage Center recognizes that the secondary Live Volume is active as the primary Live Volume.
3. The Live Volume on the secondary Storage Center becomes the primary Live Volume.
4. The Live Volume on the primary Storage Center becomes the secondary Live Volume.
Figure 79.
Managed Replications for Live Volumes
A managed replication allows you to replicate a primary Live Volume to a third Storage Center, protecting against data loss in the
event that the site where the primary and secondary
Storage Centers are located goes down. When a Live Volume swap role occurs,
the managed replication follows the primary volume to the other Storage Center.
Supported Live Volume with Managed Replication Topologies
Three specic combinations of Live Volume type and managed replication type are supported. The following table lists the supported
combinations.
Live Volume Type
Managed Replication Type
Asynchronous Synchronous
Asynchronous Asynchronous
Synchronous Asynchronous
Live Volume with Managed Replication Example Conguration
The following examples show how a managed replication behaves before and after a Live Volume swap role.
• Live Volume behavior: When a server near the primary Storage Center sends an IO request that modies the primary volume,
the changes to the primary Live Volume are replicated to the secondary Storage Center over Fibre Channel or iSCSI. When a
server near the secondary Storage Center sends an IO request to the secondary Live Volume, the secondary Storage Center
forwards the IO request to the primary volume on the primary Storage Center. These changes to the primary volume are
ultimately replicated to the secondary volume.
• Managed replication behavior: The changes to the primary Live Volume are replicated to the third Storage Center over Fibre
Channel or iSCSI. When a Live Volume swap role occurs, the managed replication follows the primary volume to the other
Storage Center.
Storage Center Replications and Live Volumes
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