Hello everyone,we are administrating an NFS high-availability cluster running on SLES11SP1 with kernel 2.6.32.59. Just recently, one of the cluster machines was updated to SLES11SP3 with kernel 3.0.82.
We are now experiencing severe hangs on NFS clients when the SLES11SP3 server is running the NFS services. An strace on the hanging processes on the client side show that is is waiting up to 60+ seconds for a "utime()" call to complete.
The problem we see is matching the problem described in the thread "v3.5 nfsd4 regression; utime sometimes takes 40+ seconds to return". If the NFS server is running on SLES11SP3, the little test program provided in this tread hangs at the "utime()" call for 60+ seconds. It hangs each time it is run! It finishes right away with 0 seconds delay is SLES11SP1 is providing NFS services, each time.
Now, in the serverside logfiles of SLES11SP3 we see these messages (not so on SP1):
-------------- kernel: [99381.184976] RPC: AUTH_GSS upcall timed out. kernel: [99381.184978] Please check user daemon is running. --------------We have always been running the NFS server without rpc.gssd on the server side, as the init script for the nfsserver also does not start rpc.gssd.
Once we started rpc.gssd on the SLES11SP3 server, using the test utility on the client shows that the first call to "utime()" succeeds right away, the second call takes ~25s to complete. But now, any consecutive runs of the utility finish with no more delay.
So can anyone confirm that with kernel 3.0+ the rpc.gssd daemon is also required on the server side for correct operation?
Has there been a change between kernel 2.6.32.59 and 3.0.x?Thus, is the init script of the nfsserver in SLES11SP3 indeed missing to start rpc.gssd?
Thank you for your help! Best regards, -- Dipl.-Ing. Joschi Brauchle, M.S. Institute for Communications Engineering (LNT) Technische Universitaet Muenchen (TUM) 80290 Munich, Germany Tel (work): +49 89 289-23474 Fax (work): +49 89 289-23490 E-mail: joschi.brauchle@xxxxxx Web: http://www.lnt.ei.tum.de/
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