intermittent errors with AIX server

Hello everybody,

I've got a problem I'm not sure how to tackle. Few times a day both Linux NFS clients report:

Feb  6 13:16:32 lx kernel: nfs: server aix not responding, timed out
Feb  6 16:18:17 lx kernel: nfs: server aix not responding, timed out
Feb  7 04:13:08 lx kernel: nfs: server aix not responding, timed out
Feb  7 07:19:59 lx kernel: nfs: server aix not responding, timed out

Otherwise, there are no problems reported. No errors on the network i/f either. The third NFS client is an AIX box and it has been running flawless for a few years. It seems like the load on the network at the time when error occurs is not particularly high.

The NFS is v3 over UDP with options soft,rsize=8192,wsize=8192. The NFS server is AIX and it's running the Oracle RDBMS. The three NFS clients are running SAP apps. The network is Gb ethernet and there are no network errors. AIX is 4.3.3 and Linux kernel is 2.4.20-ac2.

Cheers!

Dejan

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