About this task
The TCP window size specifies the amount of data that a source can send through a connection before it requires an acknowledgement from the destination for the data received. A larger TCP window size can increase
SnapMirror throughput in certain scenarios. You can change the TCP window size to optimize
SnapMirror transfers for the network in use. Therefore, you can change the TCP window size to optimize
SnapMirror transfers.
Note: When using higher TCP window sizes than the default, the system might not be able to achieve the maximum concurrent replication operations specified for the system. This is due to increased resource utilization by the higher TCP window sizes.
The maximum TCP window size that you can specify for a
SnapMirror relationship depends on the connection type, as given in the following table.
Connection type |
Default TCP window size |
Maximum TCP window size |
Single path |
1,994,752 bytes |
7,340,032 bytes (7 MB) |
Multipath |
1,994,752 bytes |
14,680,064 bytes (14 MB) |
Note: To limit the network bandwidth used by a particular SnapMirror relationship, use the kbs parameter for the relationship entry in the snapmirror.conf file.