Administrator Guide
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Storage Center Replications and Live Volumes
A replication copies volume data from one Storage Center to another Storage Center to safeguard data against local or regional data
threats. A Live Volume is a replicating volume that can be mapped and active on a source and destination Storage Center at the
same time.
Storage Center Replications
A Storage Center can replicate volumes to a remote Storage Center and simultaneously be the target of Replication from a remote
Storage Center. Using Storage Manager, an administrator can set up a replication plan for Storage Centers that supports an overall
Disaster Recovery strategy.
In the following example, a server sends an IO request that modies the source volume. The changes to the source volume are
replicated to the destination Storage Center over Fibre Channel or iSCSI.
Figure 68. Example Replication Conguration
1.
Server 2. Server IO request to source volume over Fibre Channel or
iSCSI
3. Source volume 4. Replication over Fibre Channel or iSCSI
5. Destination volume
Replication Types
There are two replication types: asynchronous and synchronous. Asynchronous replication periodically copies snapshot data to the
destination volume after a snapshot is frozen. Synchronous replication writes data to both the source and destination volumes
simultaneously to make sure they are synchronized at all times.
The following table compares the features of each replication type.
Replication Type
Storage Center Snapshot Support Active Snapshot
Support
Deduplication Support
Asynchronous Version 5.5 and later Yes Yes Yes
Synchronous Version 6.3 or later Yes Yes Yes
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