I have seen similar problems in a group of 19 SGI computers, 16 of which are
running 6.5.22, 2 at 6.5.18 and one at 6.5.16. I have just reverted to
patchSG0005526 and the problem seems to have been cleared.

In a previous article, Max Matveev wrote:
->
->>>>>> "rardin" == R Lynn Rardin writes:
->
-> rardin> In article , Max Matveev
-> rardin> wrote:
->
-> >> >>>>> "rardin" == R Lynn Rardin writes:
-> >>
-> rardin> Since installing patch 5653 on 4 systems running Irix 6.5.22m, I've
-> rardin> noticed that if I issue a df command on a Tru64 Unix machine on which
-> rardin> I have disk partitions from the 4 Irix machines mounted via NFS, I'm
-> rardin> getting timeout messages such as:
-> >>
-> rardin> NFS3 RFS3_GETATTR failed for server systemname : RPC: Timed out
-> >>
-> rardin> Eventually df completes, after the remote systems seemingly wake up.
-> >>
-> >> Are mounts over TCP or over UDP?
->
-> rardin> UDP. FWIW, I removed patch 5653 from one of the systems and
-> rardin> that seems to have alleviated the timeout problem on that
-> rardin> system, while they continue to show up on the other 3
-> rardin> systems.
->
->Sorry, should've asked it first time - was patch 5653 the only thing
->which changed? And if it was the only thing which changed, was it a
->virgin .22m or has it being patched before with either of 5397, 5518
->or 5526?
->
->Also, just so I understand it correctly: Irix is the server, Tru64 is
->the client, you see the messages on Tru64, not on Irix.
->
->The reason I'm asking all these questions is because I really cannot
->see anything in the patch which should affect the server, but if the
->system has been upgraded from, say, .20 to .22, then there is a chance
->you're running into problems with new client authentication mechanism
->which has been added in .21 and patch is just a bystander.
->
->BTW, did you talk to anybody in SGI Support about it?
->
->max