NFS problems

[Bernd Schmidt_1]

Hi,

I have a rp7410 server with HPUX 11i and some clients with HPUX 10.20. My problem is, that the 10.20 clients often loose the NFS connection. The HPUX 11i do not have this problem. Any idea??

Thx

[Clemens van Everdingen]

Hi,

Could be networking problem, NFS patch level etc. etc.

How is your patch level on 10.20 ?
Any messages in syslog ?

C.

[Bernd Schmidt_1]

I have many messages like
vmunix: NFS server host not responding still trying

I have installed the newest NFS patches.

Bernd

[Clemens van Everdingen]

Hi,

Is it all the clients having trouble ?
If yes, how is the patch level on 11.11 ?

Perhaps a duplicate IP-address ?

C.

[Michael Tully]

You should not only look at the patching on the 11i system, but also the 10.20 system.

How many 'nfsd' processes do you actually run on your server? This could be the problem also. You may wish to increase this. Have a look at your /etc/rc.config.d/nfsconf file.

[Dave Olker]

There are so many NFS differences between HPUX 11.0 and 11i, and even more differences between 10.20 and 11i. That being the case, there could be many reasons why one client might have a problem talking to a server while another 11i client might, ranging from:

o differences in the network topology
separating the clients and servers

o differences in mount options used when
mounting the filesystems

o differences in kernel parameter configuration

o hardware differences (i.e. lan cards,
switches, switch ports, etc.)

o etc.

One big difference that comes to mind between 11i clients vs. 10.20 clients is that 11i clients use NFS/TCP by default when mounting from 11i servers, while 10.20 clients would use NFS/UDP. If you are having problems in your network, this difference alone might explain why the TCP clients are able to weather the network problems while UDP clients are not.

If you're interested in more information about some of the NFS differences between HP-UX releases, you can check out the technical paper located at:

http://h21007.www2.hp.com/dspp/tech/tech_TechDocumentDetailPage_IDX/1,1701,952,00.html

or you can check out my book "Optimizing NFS Performance: Tuning and Troubleshooting NFS on HP-UX Systems," available at Amazon.com, Barnes & Nobel, etc.

Regards,

Dave