NFS

[Sarwan]

Hi freinds,

This Question may look old but i am unable to find a solution

#uname -a
HP-UX green B.11.11 U 9000/800 544746537 unlimited-user license


I am unable to unmount a File System /APP from client green

This is a nfs mounted File System. This is mounted from Blue:/app /APP nfs rsize=32768,wsize=32768,proto=udp,NFSv3 0 0 1220974403.
nfs server blue is down and we are unable to ping even this server.
this is not listed in /etc/fstab but listed in /etc/mnttab.
I tried lot of option to remove this File System but failed to do soo
I did
#mv /etc/mnttab /etc/mnttab.old
#mount -a

restarted NFS client
#/sbin/init.d/nfs.client stop
#/sbin/init.d/nfs.client start

The system hungs when i try any of these
commands
#fuser -cu /APP
#bdf /APP
#mv /APP /APP.OLD
#lsof /APP

For all this i have to close the telnet session and start a new one. I am done for the day. Please post your suggestions so that i can come and try out tomorrow.

[Laurent Menase]

just an idea
ifconfig lo0:1 addreseofblue

--> this will fake a server ' Blue '
so the next nmount should work.

umount

ifconfig lo0:1 0.0.0.0

I never tried it, but should work

[Rita C Workman]

What you may have is a hung mountpoint, or some process going to that mountpoint is still hung out there, or somebody is cd into it or some other reason.
On a simple system you can find things and clean up the rpc mess. But not knowing your server or what's going on, or what has already been tried here's a short, albeit not so pleasant, solution.

Reboot 'green'.

/Rita

[Gordon Sjodin]

Try:

ps -ef | grep /APP

then kill any associated pids.

[Kapil Jha]

after trying all of the above.
There is one utility called clear_locks which can help you.
Just clear the locks for both the machines and this may help you.

BR,
Kapil+

[Dave Olker]

Some bozo wrote a technical paper about this subject a while back. Suggestions in there might still work...

http://docs.hp.com/en/3929/ForciblyUnmountingNFSFilesystems.pdf

[Sarwan]

I have tried all the above option:


=====================================================================================
Laurent Menase,

I am unable to find out ipaddress of blue as it is down

=====================================================================================

Rita,

Reboot green is not possible as it is a production box, have to go through lot of process and need to give explaination also

=====================================================================================
Kapil,


Clear_locks

#green>clear_locks -s blue
Clearing locks held for NFS client ironwood on server blue
RPC: Unknown host
=====================================================================================
Gordon Sjodin,

Kill process related to this

#green>ps -ef |grep -i /APP
root 22935 18392 0 01:24:10 pts/tH 00:00 mount -o soft blue:/app /APP
root 16021 1 0 09:38:24 ? 00:00 fuser -cu /APP
root 16799 1 0 11:47:38 pts/tB 00:00 lsof /USERS
root 15028 1 0 06:36:31 ? 00:00 grep -i cd /APP
root 16342 1 0 10:47:43 ? 00:00 fuser -CK /APP
root 15293 1 0 07:46:06 ? 00:00 fuser -cu /APP
root 16393 1 0 10:52:08 ? 00:00 fuser -cu /APP
root 16812 16753 0 11:50:23 pts/tB 00:00 mv /APP /APP.OLD
root 22978 22942 1 01:31:09 pts/tJ 00:00 grep -i /APP
root 16801 1 0 11:48:09 pts/tB 00:00 lsof /APP
root 18351 1 0 23:49:42 ? 00:00 fuser -cu /APP

i am unable to kill any of these process
=====================================================================================

now going through Doc provided by Dave

[Dennis Handly]

>Reboot green is not possible as it is a production box

Where are you in getting blue back up?

[Sarwan]

All these problem started because backup is not running on blue because of this NFS stale issue

[Dennis Handly]

>All these problem started because backup is not running on blue because of this NFS stale issue

I thought you said the hangs on green are due to blue crashing?