nfs client hanging

[Talpey, Thomas]

At 09:51 AM 6/6/2008, Guillaume Rousse wrote:
>Talpey, Thomas a écrit :
>> At 08:56 AM 6/6/2008, Guillaume Rousse wrote:
>>> Talpey, Thomas a écrit :
>>>> BTW, the first rpc in your trace below is "nfs4", but all the others are
>>>> "nfs3" (which is rather odd since the client shouldn't be falling back).
>>>> What exact mount command are you using?
>>> It's automounter-handled, but it should be something as:
>>> mount -t nfs4 msr-nas1:/vol/msr1_unix/adapt /home/adapt -o 
>>> hard,intr,nosuid,nodev,rw
>> 
>> Does the mount succeed if you do it by hand?
>Yes. But the problem is not an immediate mount failure, it only happens 
>thereafter, and I'm unable to find when exactly.

At this point, it could be anything, but on a hunch, do you have the
iptables firewall enabled on the client? If so, and if you have read and
write delegations enabled on the filer, perhaps there is an issue with
callbacks. These can be disabled on the filer for testing.

To verify, could you post the results of "options nfs.v4" on the filer,
and the relevant line of "cat /proc/mounts" on the client after mounting
the filesystem by hand? Also, the output of "nfsstat" on the client before
and after a hang might help as well.

If these don't reveal anything, a network trace might be the next step.

Tom.