Dell Storage Manager 2020 R1 Administrator's Guide

Asynchronous Replication

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

For asynchronous replication, you can enable the following options:

• Replicate Active Snapshot: Attempts to keep the Active Snapshots (current, unfrozen volume data) of the source and destination volumes synchronized, which could require more bandwidth. Data that is written to the source volume is queued for delivery to the destination volume. If the local Storage Center or site fails before the write is delivered, it is possible that writes will not be delivered to the destination volume. When this feature is disabled, snapshots are copied to the destination after they are frozen.
• Deduplication: Reduces the amount of data required to transfer snapshots to the destination Storage Center by copying only the changed portions of the snapshot history. This is accomplished by comparing the changed data in the snapshot being replicated with the previous data block by block, and transmitting only blocks that differ. While deduplication can be resource-intensive, it is useful when replicating volumes over lower bandwidth WAN links.