Interesting thread, I've got a similar situation with a 3140 with 7.3.6P2 connected to an Oracle host over 1GbE using NFS which showing spikes in latency on the host. The Oracle host is showing dropped packets on its storage interface and I am seeing lots of messages logged like:
Mon Mar 21 12:06:33 GMT [Filer1: nfsd.tcp.close.idle.notify:warning]: Shutting down idle connection to client (x.x.x.x) where transmit side flow control has been enabled. There are 131 outstanding replies queued on the transmit buffer. This socket is being closed from the deferred queue.
My thought was the Oracle hosts interface is saturated and its not responding to the NFS acknowledgements in time and so the Netapp is dropping the NFS requests.
The 1GbE interface is being upgraded on the Oracle host but one of my concerns is hitting bugs that have been fixed in later 8.1.x releases once we remove the bottleneck on the Oracle host. Particularly the DNFS and load related bugs. I then read your comment:
"The only time I’ve seen this issue occur, other than an actual total failure of network connectivity, is with some Oracle DNFS bugs."
Is it possible to confirm whether this is simply the Filer flushing unacknowledged NFS requests or if this is actually the DNFS bug?
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