Volume SnapMirror supports interoperability between volumes in 32-bit and 64-bit aggregates for different Data ONTAP releases. For systems in a volume SnapMirror relationship, the format of a volume can be different from that of its containing aggregate. When the SnapMirror relationship is initialized or updated, the format of the destination volume changes to match the format of the source volume.
The following interoperability matrix shows the different combinations of volume types for which a volume SnapMirror relationship is supported across Data ONTAP releases:
|Destination Volume Type|
|Data ONTAP 7.3.x||Data ONTAP 8.0.x||Data ONTAP 8.1.x||Data ONTAP 8.2|
|Source Volume Type||Data ONTAP 7.3.x||32-bit||Yes||Yes1||No||Yes1||Yes1||Yes1||Yes1,3|
|Data ONTAP 8.0.x||32-bit||No||Yes||No||Yes1||Yes1||Yes1||Yes1,3|
|Data ONTAP 8.1.x||32-bit||No||No||No||Yes||Yes||Yes||Yes|
|Data ONTAP 8.2||32-bit||No||No||No||No||No||Yes||Yes|
1 After a volume SnapMirror relationship is broken, resynchronization to the original source volume does not work until the Data ONTAP version on the source system is upgraded to match the version on the destination system.
2 Do not grow the source volume beyond 16 TB until the 64-bit expansion process is complete on the aggregate and the destination volume grows beyond 16 TB. The 64-bit expansion process expands a 32-bit aggregate and all its containing volumes to 64 bits, when new disks are added, such that the total size of the aggregate expands beyond 16 TB.
3 A 64-bit source volume that has data compression enabled cannot be mirrored to a 32-bit aggregate.
You can use interoperability support in situations such as the following:
Migrating data between volumes in 32-bit and 64-bit aggregates
For example, you can migrate data from a 32-bit source volume in a 32-bit aggregate to a 64-bit destination volume in a 64-bit aggregate, with the source system running Data ONTAP 8.0 and the destination system running Data ONTAP 8.1.
Expanding 32-bit aggregates to 64-bit
For example, if the source and the destination systems in a volume SnapMirror relationship contain 32-bit volumes in 32-bit aggregates, you can expand aggregates and volumes on both the systems to 64-bits.
For more information about interoperability between 32-bit and 64-bit volumes, see the technical report SnapMirror Async Overview and Best Practices Guide.