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Dell Storage Manager 2020 R1 Administrator's Guide

Replication Behavior When a Destination Volume Fails

When the destination volume becomes unavailable, each replication type behaves slightly differently. The replication types also recover differently when the destination volume comes back online.

Description of impact of failures on asynchronous and synchronous replications.
Scenario Asynchronous Replication Synchronous Replication
Destination volume is unavailable Allows IO requests to the source volume
  • High Consistency mode: Fails IO requests to the source volume
  • High Availability mode: Allows IO requests to the source volume
Destination volume comes back online Resumes transferring snapshots from the source volume and re-copies Active Snapshot data (if enabled)
  • High Consistency mode: Resumes accepting IO requests to the source volume
  • High Availability mode: Resumes transferring snapshots from the source volume and copies the Active Snapshot data that was missed while the destination volume was unavailable

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