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Supported cascade configurations for SnapMirror

Only certain types of SnapMirror configurations support cascading.

The supported cascading configurations are listed in the following table. Any other configuration, such as extending the cascade beyond the number of cascades shown in the table, is not supported. This limitation does not apply to the strictly asynchronous volume SnapMirror cascading configuration, which can propagate to more than three systems.

The following table lists the two-hop cascade configurations that are supported for SnapMirror replication:

System A to system B System B to system C
Synchronous SnapMirror Asynchronous volume SnapMirror
Asynchronous volume SnapMirror Asynchronous volume SnapMirror
Asynchronous volume SnapMirror Qtree SnapMirror
Qtree SnapMirror Asynchronous volume SnapMirror

Example

The first line states that system A has a synchronous SnapMirror relationship with system B, and that system B has an asynchronous volume SnapMirror relationship with system C.

When the first hop in the cascade is synchronous SnapMirror, the synchronous replication can be to one destination system only. Subsequent SnapMirror replications cascading from that destination system must be asynchronous and can be to multiple destination systems.