nfs hung issue

HI experts,

  I have issue with one of our  server where nfs mount gets hung often.

there is mount NAS mount on this server..which gets hung very often..this is the error messages we get while i unmount and mount the nfs mount.

 RPC: error 5 connecting to server
nfs_statfs: statfs error = 5

server is running RHEL4 update 5..

what could be the reason?..is this a problem with nfs version or kernel version or application work flow side.

  please help me here.



sants_ppAsked:
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fosiul01Connect With a Mentor Commented:
Do you have any network sloness ??

Normaly the disadvantage of NFs is, if there is any network problem or if client try to  access NFS the server but due to slowness or network problem its unable to connect , its gets hang ...


have you tryed with ping to see if ping reply is Ok when this hang happended ..

look at server load to see if those are ok
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agriesserConnect With a Mentor Commented:
What are the options you're using to mount the nfs share? Usually you should go with so-called hard mounts, as they are a better choice when it comes to data integrity, but in your specific case switching to soft-mounts might help out here, because soft mounts are more reliable and don't hang that much.

There are several other tuning options for nfs mounts, like the number of retransmissions, etc.

I'd suggest you find out with what options your NFS share is mounted and then have a look at `man nfs` on your linux box to read more about these options and tune them then to your needs.
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sants_ppAuthor Commented:
is there a way to check the currently running nfs version on the client side and also server side..
i am suspecting problem with nfs version
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fosiul01Commented:
run nfsstat command
it will give you full informaiton

Once i had a problem due to duplex speed of client and server
if both are not same, client will face problem to access nfs server
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fosiul01Commented:
sorry its

nfsstat --version

do man nfsstat
it will give you extra options
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