On 08/23/2012 01:44 PM, Klaus Steinberger wrote:
> 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
>
We have sl6 as a server and sl6 and sl5 clients... Nfs hangs occur on 
sl6 client... (at least I didn't notice any on sl5 clients)...

Soft mount isn't an option because of the nature of the service running 
on the machine.
Maybe I could try automount if there will be any difference..

Thanks,
Barbara