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nfs server SUMMARY LONG ATTEMPT: NFS server getting "NFS3 Server servername is not responding" message (1 viewing) (1) Guests
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TOPIC: nfs server SUMMARY LONG ATTEMPT: NFS server getting "NFS3 Server servername is not responding" message
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O'Brien, Pat (Visitor)
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nfs server SUMMARY LONG ATTEMPT: NFS server getting "NFS3 Server servername is not responding" message  
We have a nfs server with several clients over udp.  these clients have normally performed heavy 50~80 GB file(s) copys to the nfs server.  After upgrading to 5.1, we began reciveing floods of nfs3 server servername not responding still trying followed by nfs3 server servername is ok .  the server does utilize gigbit ethernet but a client gets messages over 100 fd. All interfaces have been re-checked.  In the begining the server was running with 16 nfsd, which have been increased to 64.  this reduced the quantity a couple notches, however they can still be reproduced with a 3 gb file in a few minutes. the client still had the default 7 nfsiod which has been increased to 16 and then 24 with the condition getting worse.  reseting the client number of nfsiod to 4 does seem to eliminate the issue, and also throttles network i/o back.  we have reset this back to the default 7. netstat is not showing any dropped connections or full sockets or reaching peak network threads from netstat -m.  nfsstat does continue the log a few badxid's and timeo, but below a percentage point or so which I have been led to believe is ok.  reviewing the mount -l output data, we see that the nfs read & write memory buffers are larger than the prior 4.x version by a factor of 6.  we have tried reducing these buffers, but this seems to make the issue worse.  I am currently thinking about increase udp send & recieve buffers to something larger but less than sb_max and or the nfs mount buffers.   BUT, I have this knawing feeling I am looking in the wrong area. I am wondering if this message means something else like maybe my nfs server disks may not be up to the job.  with some testing I see that minimally configured (64mb of cache) hsz70 are worse than (256mb cache) hsg80.  I would expect though if this was true, to log something for a scsi error which I am not. Any thoughts or brilliant ideas welcomed. pmob
 
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