Object limits for ONTAP SnapMirror active sync
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When preparing to use SnapMirror active sync, be aware of the following object limits.
Consistency groups in a cluster
Consistency group limits for a cluster with SnapMirror active sync are calculated based on relationships and depend on the version of ONTAP used. Limits are platform-independent.
| ONTAP version | Maximum number of relationships |
|---|---|
ONTAP 9.11.1 and later |
50* |
ONTAP 9.10.1 |
20 |
ONTAP 9.9.1 |
5 |
* Beginning with ONTAP 9.16.1, SnapMirror active sync supports four-node clusters in symmetric active/active configurations. In a four-node cluster, 100 consistency groups are supported.
Volumes per consistency group
The maximum number of volumes per consistency group with SnapMirror active sync is platform independent.
| ONTAP version | Maximum number of volumes supported in a consistency group relationship |
|---|---|
ONTAP 9.15.1 and later |
80 |
ONTAP 9.10.1-9.14.1 |
16 |
ONTAP 9.9.1 |
12 |
Volumes
Volume limits in SnapMirror active sync are calculated based on the number of endpoints, not the number of relationships. A consistency group with 12 volumes contributes 12 endpoints on both the primary and secondary cluster. Both SnapMirror active sync and SnapMirror synchronous relationships contribute to the total number of endpoints.
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These limits apply to FAS, AFF, and ASA systems. If you have an ASA r2 system (ASA A1K, ASA A90, ASA A70, ASA A50, ASA A30, or ASA A20), see ASA r2 documentation. |
The maximum endpoints per platform are included in the following table.
| Platform | Endpoints per HA for SnapMirror active sync | Overall sync and SnapMirror active sync endpoints per HA | ||||
|---|---|---|---|---|---|---|
ONTAP 9.11.1 and later |
ONTAP 9.10.1 |
ONTAP 9.9.1 |
ONTAP 9.11.1 and later |
ONTAP 9.10.1 |
ONTAP 9.9.1 |
|
AFF |
400* |
200 |
60 |
400 |
200 |
80 |
ASA |
400* |
200 |
60 |
400 |
200 |
80 |
* Beginning with ONTAP 9.16.1, SnapMirror active sync supports four-node clusters in symmetric active/active configurations. The total limit for a four-node cluster is 800 endpoints.
SAN object limits
SAN object limits are included in the following table. The limits apply regardless of the platform.
| Object in a SnapMirror active sync relationship | Count |
|---|---|
LUNs per volume |
|
Number of unique LUNs, namespaces, or storage units per 2 x 2 SnapMirror active sync solution |
4,096 |
Number of unique LUNs, namespaces, or storage units per 4 x 4 SnapMirror active-sync solution (available beginning with ONTAP 9.16.1) |
6,144 |
LIFs per SVM (with at least one volume in a SnapMirror active sync relationship) |
256 |
Inter-cluster LIFs per node |
4 |
Inter-cluster LIFs per cluster |
8 |
NVMe object limits
Beginning with ONTAP 9.17.1, SnapMirror active sync supports the NVMe protocol. NVMe object limits are included in the following table.
| Maximum objects in a SnapMirror active sync relationship | Count |
|---|---|
Number of namespace maps per node |
4K |
Cluster size |
2 nodes |
Number of consistency groups per HA pair |
50 |
Number of volumes in a single NVMe SnapMirror active sync consistency group |
80 |
Number of volumes in an HA pair |
400 |
NVMe subsystems per consistency group |
16 |
Namespace maps per consistency group |
256 |