NFS Server not responding - only for sometime

[amar_12]

Hi
Help reqd.
I have a 2node cluster in WAN setup.I get NFSServer not responding error at 2000hrs everyday.

need help in analysing this

I cant keep track of cron jobs as the load is more on the server and it is 24x7
it happens for only 3 - 4 mins and start working fine again.
it happens every day
NFS patches are uptodate
AUTOMOUNT is used
no errors in nettl.LOG000

regards

[Alessandro Pilati]

Amar,
as first steps, analyze what happens on the server during that 4 minutes after 20.00 ( e.g. the cronjobs running in that moment, the network connections, the sar and nfsstat statistics ).

Run "nfsstat -c" ( on the client ) and check for a great number of retrans

Run "nfsstat -s" ( on the server ) and make the same checks

Is your mount tcp or udp?
you have hard or soft mount?

Check the overload of your network during that minutes ( use a network analyzer , for example Ethereal http://www.softpedia.com/get/Network-Tools/Protocol-Analyzers-Sniffers/Ethereal.shtml )

Check also this checklist:
http://connectivity.hummingbird.com/support/nc/nfs/windows95/other34.html?cks=y


Waiting for more details,
Rgds,
Alex

[Andres Stickar]

I'm guessing, but, can you make an nslookup at 20:00 hs. ?
If not, probably you are loosing the DNS conecction at this time, everyday.

good hunting.

A.

[Devender Khatana]

Hi,

It is usuallu caused due to high network utilization only. Check the same at the time when you get this error. That should give you some clue.

HTH,
Devender