Additional restrictions and limitations
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There are several additional restrictions and limitations when using the SnapMirror Business Continuity solution.
Consistency groups
The maximum number of SnapMirror Synchronous consistency group relationships in a cluster is five, a limit which is platform-independent. If you reach or attempt to exceed this limit, the following message is displayed:
The number of SnapMirror Synchronous consistency group relationships in a cluster cannot exceed 5
Volumes per consistency group
The maximum number of volumes supported per SnapMirror Synchronous consistency group relationship is twelve, a limit which is platform-independent. If you reach or attempt to exceed this limit, the following message is displayed:
The number of volumes in a SnapMirror Synchronous Consistency Group cannot exceed 12
Volumes
The limit is on the number of endpoints and not the number of relationships. A consistency group with 12 volumes contributes 12 endpoints on both the source and destination.A SnapMirror Synchronous relationship with both source and destination volumes on the same HA pair contributes 2 endpoints. |
The maximum endpoints per platform are included in the following table.
S. No | Platform | Endpoints per HA for SM-BC | Overall sync and SM-BC endpoints per HA |
---|---|---|---|
1 |
AFF |
60 |
80 |
2 |
ASA |
60 |
80 |
SAN object limits
The following SAN object limits are included in the following table and apply regardless of the platform.
Limits of objects in an SM-BC relationship | Count |
---|---|
LUNs per volume |
256 |
LUN maps per node |
2048 |
LUN maps per cluster |
4096 |
LIFs per VServer (with at least one volume in an SM-BC relationship) |
256 |
Inter-cluster LIFs per node |
4 |
Inter-cluster LIFs per cluster |
8 |