Hi,

>> Nfs4 client randomly hangs on a file or directory (for instance when
>> performing df or find) and after a few seconds continues. When
>> preforming strace, it hangs on getdents system call.
>>
>> Errors on the server side:
>> Aug 19 21:29:08 host kernel: nfs: server host2 not responding, still trying
>> Aug 19 21:31:17 host kernel: nfs: server host2 OK
>>
>> After a while the load on client and server side increases intensively,
>> then system on the client side crashes. Reboot required.
> 
>> Mount options:
>> Flags:
>> rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,noresvport,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=IP,local_lock=none,addr=IP
>>

SL5 or SL6 on Server side?

We had many hungs with SL5 as server but with kerberos auth, never tried NFS4
with sec=sys.

Sincerly,
Klaus

-- 
Rechnerbetriebsgruppe / IT, Fakultät für Physik
Klaus Steinberger
FAX: +49 89 28914280
Tel: +49 89 28914287