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Recovery in Multiwrite

A multiwrite update can fail. Usually, this is because a DSA is down or otherwise offline. When the DSA comes back online again, the system must be recovered.

With multiwrite replication, there are two ways you can recover the system: multiwrite recovery and DISP recovery. If recovery is with multiwrite, the replication scheme is just called multiwrite. If recovery is with DISP, the replication scheme is called Multiwrite-DISP.

If you want to ensure that a region continues to service a namespace even if one DSA fails, you need at least three DSAs in each region. This is because if one DSA fails, you may need to take a second DSA offline to resynchronize the failed DSA.