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Dell Storage Manager 2020 R1 Administrator's Guide

Synchronous Replication Modes

The synchronous replication mode controls how the source volume behaves when the destination volume is unavailable.

There are two synchronous replication modes:

  • High Availability Mode: Accepts IO requests to the source volume when the destination volume is unavailable (or when latency is too high) to avoid interrupting service. However, if writes are accepted to the source volume, the destination volume data becomes stale.
  • High Consistency Mode: Prevents IO requests to the source volume when the destination volume is unavailable to make sure that the volumes remain identical. However, the source volume cannot be modified during this time, which can interrupt operations.

When the destination volume comes back online, both modes resume transferring snapshots and Active Snapshot data from the source volume.


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