Administrator Guide

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.

To perform replications, a Remote Instant Replay (Replication) license must be applied to the source and destination Storage Centers.

To create a Live Volume from a replication, a Live Volume license must be applied to the source and destination Storage Centers.

NOTE: The Live Volume feature is not supported on storage systems with front-end SAS connectivity.

Topics:

• Storage Center Replications

• Managing Cross-Platform Replication

• Storage Center Live Volumes

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 I/O request that modifies the source volume. The changes to the source volume are replicated

to the destination Storage Center over Fibre Channel (FC) or iSCSI.

Figure 46. Example Replication Configuration

Server 2. Server I/O request to source volume over FC or iSCSI

3. Source volume 4. Replication over FC 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.

Asynchronous Replication

Asynchronous replication copies snapshots from the source volume to the destination volume after they are frozen.

NOTE:

By default, data is replicated from the source volume to the lowest storage tier of the destination volume. To

change this default, modify the settings for a replication.

476 Storage Center Replications and Live Volumes