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So it is the client was writing to the server. Several things:

1. The client seems have the TSO feature enabled on the NIC so we cannot see each of the MSS-size tcp segment but a single large segment from smb which have us pain on sequence analysis.

2. window full observed from the NetApp server, which indicates that the server-side process power cannot keep in pace with the incoming packets.

3. looks like delayed-Ack was disabled.

4. would like to see the performance while the client was in the same subnet as the NetApp gear, just to quickly isolate out the issue out of any intermediate devices.

So it is the client was writing to the server. Several things:

1. The client seems to have the TSO feature enabled on the NIC so we cannot see each of the MSS-size tcp segment but a single large segment from smb which have us pain on sequence analysis.

2. window full was observed from the NetApp server, which indicates that the server-side process power cannot keep in pace with the incoming packets.

3. looks like delayed-Ack was disabled.

4. would like to see the performance while the client was in the same subnet as the NetApp gear, just to quickly isolate out the issue out of any intermediate devices.