Supported SnapMirror three-hop cascade configurations

Only certain combinations of SnapMirror replication types are supported for three-hop cascade configurations.

Cascades of three SnapMirror relationships whose first relationship is a synchronous SnapMirror relationship are supported on Data ONTAP 7.1.2 and 7.2.1 releases, and later releases.

Table 1. Three-hop cascade configurations supported. The following table lists the supported three-hop cascade configurations supported for SnapMirror replication.
Storage system A to Storage system B	Storage system B to Storage system C	Storage system C to Storage system D
Synchronous SnapMirror (volume)	Asynchronous SnapMirror (volume)	Asynchronous SnapMirror (volume)
Synchronous SnapMirror (volume)	Asynchronous SnapMirror (volume)	Asynchronous SnapMirror (qtree)
Asynchronous SnapMirror (volume)	Asynchronous SnapMirror (volume)	Asynchronous SnapMirror (volume)
Asynchronous SnapMirror (volume)	Asynchronous SnapMirror (volume)	Asynchronous SnapMirror (qtree)
Asynchronous SnapMirror (volume)	Asynchronous SnapMirror (qtree)	Asynchronous SnapMirror (volume)
Asynchronous SnapMirror (qtree)	Asynchronous SnapMirror (volume)	Asynchronous SnapMirror (volume)

Note: If the first SnapMirror relationship in a cascade is a synchronous volume SnapMirror relationship, the version of Data ONTAP on the source storage system must be the same release or later as that on the destination storage system.

For example, both source and destination storage systems of the synchronous SnapMirror relationship must run Data ONTAP 7.2.1 if you have a cascade configuration depicted in the following table.

Storage system A to Storage system B	Storage system B to Storage system C	Storage system C to Storage system D
Synchronous SnapMirror (volume)	Asynchronous SnapMirror (volume)	Asynchronous SnapMirror (volume)

Parent topic: Data replication from one destination to another in a series (cascading)