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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