topic Re: NFS automount timeout issues in Operating System - HP-UX

NFS automount timeout issues

Craig Irvine — Tue, 11 Jan 2005 01:38:59 GMT

Hi All,

We are setting up 2 systems for production SAP in a ServiceGuard environment. The systems are HP-UX 11.23 and so have the HA AutoFS updates. /etc/rc.config.d/nfsconf on both nodes (node1, node2) have:
AUTOMOUNT_OPTIONS="-t 10"
AUTOMOUNTD_OPTIONS="-L"

I have set up a simple test package (tstpkg)that has a single logical volume that is setup to automount to both nodes. The automounting is working fine until I halt the package on node1 and start it on node2.

I run the following commands (prefixed by the node name):
node1: cmrunpkg -n node1 tstpkg
node1: cd /mnt/tstdir1 #works instantly
node1: cd /
node2: cd /mnt/tstdir1 #works instantly
node2: cd /
node2: cmhaltpkg tstpkg
node2: cmrunpkg -n node2 tstpkg
node2: cd /mnt/tstdir1 #approx 10 sec. delay
node2: cd /
node1: cd /mnt/tstdir1 #hangs for 10 min. then cd's OK

syslog.log on node1 has the following message from that last cd:
Jan 11 16:19:06 node1 vmunix: NFS server tstpkg not responding still trying
Jan 11 16:28:13 node1 vmunix: NFS server tstpkg ok

The first message appears 1 minute after issuing the last "cd /mnt/tstdir1" command on node1.

Ultimately the whole thing works but the 10 minute delay shouldn't be happening. Does anyone know the reason for the delay??

Thanks for any help.

Regards
Craig

Re: NFS automount timeout issues

Peter Godron — Tue, 11 Jan 2005 04:34:39 GMT

Craig,
Take a look at ITRC docs NETUXKBRC00006283 and KBAN00000261.
This may give you a few new pointers.
Regards

Re: NFS automount timeout issues

Craig Irvine — Tue, 11 Jan 2005 19:56:14 GMT

Thanks Peter, they are a couple of very good documents and provided hints at other documents to look at.

The problem wasn't performance related as I am the only person/process using the 2 nodes (let alone using NFS on the nodes) and I was just cd'ing to the automounted directories. The issue seemed to be with stale entries in /etc/rmtab which mountd uses to populate its tables when it starts.

For others that may have a similar problem I followed the following steps:
- shutdown package(s) using NFS
- /sbin/init.d/nfs.client stop
- /sbin/init.d/nfs.server stop
- /sbin/init.d/nfs.core stop
- /sbin/init.d/Rpcd stop
- check for any stale nfs related processes
- clean out /etc/rmtab
- /sbin/init.d/Rpcd start
- /sbin/init.d/nfs.core start
- /sbin/init.d/nfs.server start
- /sbin/init.d/nfs.client start
- start packages and test if necessary

I can now swing the package between the nodes at will and the automount connects OK.

Regards
Craig

Re: NFS automount timeout issues

Craig Irvine — Mon, 14 Feb 2005 02:10:16 GMT

As per my last post.