Running OnTap 9.3. Is there a way to increase the TCP window size for snapmirror connections?
I used ::*>network connections options buffer modify -receive-buffer 7168 -network WAN -protocol tcp -service ctlopcp and increased the buffer size. Understand there are 12 tcp connections per node. When I run multiple snapmirrors at once I get over 200MB/s. When I run a single mirror from source node to destination node, I only see about 35MB/s.
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Could you please check if there is any throttle applied on the snapmirror relation level.
::snapmirror show -destination-path -fields throttle
if yes please set it to "unlimited" and retry the snapmirror update.
Also could you let us know how is above throughput number are determined?
Snapmirror performance troubleshoot would require deep investigation including capture of packet trace and perf stats logs.
to troubleshoot further i would request you to open a support ticket with us so we can look into it.