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So these seem fine to me (i.e., the max is greater than 32768). Is there an NFS (as opposed to TCP) setting I should be tweaking? Any ideas why the NetApp is issuing those warnings? Any other suggestions on how to debug this problem?
Sounds like a very interesting problem. The only time I've gotten such errors have been NFSv4 issues between Linux and Solaris hosts, never with a NetApp.
You might try asking on the linux-nfs[1] list as well as the toasters[2] list. I'd be interested to hera what you come up with. Very strange symptoms though. Are you using NFS over TCP or UDP? It seems like one side is attempting to use a stale session...
I've always found NFS stuff like this very difficult to troubleshoot. If you can reproduce the problem on demand maybe you could get a packet dump right when the issue begins...
Ray
[1]: http://vger.kernel.org/majordomo-info.html [2]: http://toasters.mathworks.com/toasters.html