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Maximum number of concurrent replication operations

The limit on the number of concurrent replication operations depends on your system model. The system resources are shared between SnapMirror and SnapVault replication operations. Therefore, the limit for a particular type of replication is reduced if there are any other types of replication operations being performed concurrently.

A SnapMirror replication or a SnapVault backup consists of two replication operations: one operation on the source system and the other on the destination. Therefore, if a system is both a source and a destination, it uses two replication operations. For example, systemA is the source as well as the destination system in a SnapMirror or SnapVault relationship and the total number of replication operations available for that relationship is 100. Then, the total number of available replication operations, when the transfer is active, is 98.

Each value listed in the following two tables indicates the maximum number of concurrent replication operations allowed for a specific model, when using a single type of replication. The values are exclusive, and not cumulative. For example, if you are using the maximum number of synchronous SnapMirror replication operations for a system as a source, you cannot use any more replication operations of any type for the system.

The NearStore personality license is enabled by default in Data ONTAP 8.1. However, to enable the NearStore option, you must set the licensed_feature.nearstore_option.enable option to on.
The maximum number of concurrent replication operations without the NearStore option enabled are:
Model Volume SnapMirror Synchronous SnapMirror Qtree SnapMirror SnapVault Open Systems SnapVault
  SRC DST SRC DST SRC DST SRC DST DST
FAS2220 50 50 16 16 64 64 64 64 16
FAS2240 50 50 16 16 64 64 64 64 16
CBvM100 N/A N/A N/A N/A N/A N/A 16 16 N/A
FDvM100 8 8 8 8 16 16 16 16 N/A
3140 50 50 16 16 64 64 64 64 16
3160 50 50 16 16 64 64 64 64 16
3170 50 50 16 16 64 64 64 64 16
3210 50 50 16 16 64 64 64 64 16
3220 50 50 16 16 64 64 64 64 16
3240 50 50 16 16 64 64 64 64 16
3250 50 50 16 16 64 64 64 64 16
3270 50 50 16 16 64 64 64 64 16
6040A 100 100 24 24 96 96 96 96 24
6080 150 150 32 32 128 128 128 128 32
6210 150 150 32 32 128 128 128 128 32
6220 150 150 32 32 128 128 128 128 32
6240 150 150 32 32 128 128 128 128 32
6250 150 150 32 32 128 128 128 128 32
6280 150 150 32 32 128 128 128 128 32
6290 150 150 32 32 128 128 128 128 32
FAS8020 150 150 32 32 128 128 128 128 32
FAS8040 150 150 32 32 128 128 128 128 32
FAS8060 150 150 32 32 128 128 128 128 32
The maximum number of concurrent replication operations with the NearStore option enabled are:
Model Volume SnapMirror Synchronous SnapMirror Qtree SnapMirror (single path) Qtree SnapMirror (multipath) SnapVault Open Systems SnapVault
  SRC DST SRC DST SRC DST SRC DST SRC DST DST
FAS2220 50 100 16 16 120 120 60 60 120 120 64
FAS2240 50 100 16 16 120 120 60 60 120 120 64
3140 50 100 16 16 160 160 80 80 160 160 64
3160 50 100 16 16 320 320 160 160 320 320 128
3170 50 100 16 16 384 384 192 192 384 384 128
3210 50 100 16 16 120 120 60 60 120 120 64
3220 50 100 16 16 320 320 160 160 320 320 128
3240 50 100 16 16 320 320 160 160 320 320 128
3250 50 100 16 16 320 320 160 160 320 320 128
3270 50 100 16 16 320 320 160 160 320 320 128
6040A 100 200 24 24 384 384 192 192 384 384 96
6080 150 300 32 32 512 512 256 256 512 512 128
6210 150 300 32 32 512 512 256 256 512 512 128
6220 150 300 32 32 512 512 256 256 512 512 128
6240 150 300 32 32 512 512 256 256 512 512 128
6250 150 300 32 32 512 512 256 256 512 512 128
6280 150 300 32 32 512 512 256 256 512 512 128
6290 150 300 32 32 512 512 256 256 512 512 128
FAS8020 150 300 32 32 512 512 256 256 512 512 128
FAS8040 150 300 32 32 512 512 256 256 512 512 128
FAS8060 150 300 32 32 512 512 256 256 512 512 128
SRC—Source; DST—Destination
Note: The NearStore personality license is not supported on the following systems:
  • CBvM100
  • FDvM100
The following factors affect the maximum number of concurrent replication operations that a system can achieve:
  • Heavy use of system resources, such as CPU, memory, disk bandwidth, or network bandwidth, might reduce the resources available for SnapMirror or SnapVault operations.
  • The use of TCP window sizes higher than the default value, for SnapMirror relationships, might restrict the system from achieving the maximum limit specified.
  • A system with the NearStore personality enabled is optimized as a destination for SnapMirror and SnapVault replication operations.

    Therefore, a system with the NearStore personality can handle more replication operations than a system without the NearStore personality.