Starting Data ONTAP 7.2.5, the SnapMirror TCP receive window size has been increased. Recall in my earlier posting about SnapMirror over loopback, we tried to ascertain the theoretical bandwidth of the SnapMirror over the loopback adapter.
The new increased limit for SnapMirror Window Size is 8388608 bytes.
Bandwidth (bytes/s) * Delay (s) = Window Size (Bytes)
So for an average round trip delay of 0.060ms (which is the observed packet loss when pinging my loopback adapter), the theoretical maximum bandwidth for SnapMirror would be
Bandwidth = 8388608 / ( 0.060 / 1000 ) = bytes/s) = 139.81 GB/s = 1.118 Tbps
This is even before some of the additional enhancements that can be made to the SnapMirror setup, such as De-duplication and others.
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