topic Mount problem in Operating System - HP-UX

Mount problem

hangyu — Tue, 07 Nov 2006 21:46:20 GMT

In my system ,there is a mount /dev/sda1 /Ora1 , I have just umount it and this mount do not shown in "bdf" again . but now , I want to mount it again ( mount /dev/sda1 " , it pop "mount: /sda1 already mounted or /Ora1 busy" , can advise how can I mount it back ? thx

Re: Mount problem

Patrick Wallek — Tue, 07 Nov 2006 22:07:43 GMT

What happens if you do 'fuser -uc /Ora1'? What gets returned?

Were any processes using this when you unmounted it?

By the way, is this HP-UX? HP doesn't normally use disks like sda1. This appears to be linux of some variety.

Re: Mount problem

Rajeev Shukla — Tue, 07 Nov 2006 22:11:17 GMT

It looks like either /etc/mnttab still contains /Ora1 mount or there is someone there inside the /Ora1 directory

Re: Mount problem

hangyu — Wed, 08 Nov 2006 01:06:10 GMT

thx replies,

when use fuser , and do not find any user ,
Yes , it is linux ,
I have already delete the mount point in mnttab ( mtab in linux ) , but still can't umount .

Re: Mount problem

Yogeeraj_1 — Wed, 08 Nov 2006 02:04:59 GMT

hi,

what does "fuser -m /dev/sda1" show?

In linux, it is mostly related to the Device mapper. If you disabled disable dm-mod/dm-mirror and restart this should be OK.

kind regards
yogeeraj

Re: Mount problem

hangyu — Wed, 08 Nov 2006 02:13:50 GMT

thx reply ,

when run "fuser -m /dev/sda1" , there is nothing output .

How to restart disabled dm-mod/dm-mirror ? thx

Re: Mount problem

Frank de Vries — Wed, 08 Nov 2006 02:48:52 GMT

Two advices:

Ok dbf is one thing , but what does the
mount command return ?
Just type mount

1) Make sure you are not with any prompt
or cursor on /Ora1 , or left another session
there. Check child processes su - or rlogins
that arrived on this /Ora1. Exit and kill
all sessions (see who -r).
Login in via the console, so you know
it is only you loggin in.

2) If you are sure there is nothing on /Ora1
and fuser -cu shows nothing then you need
to install lsof , which will give more detail
of lost filehandles, network processes, memory stuff etc. etc. You may have something
in memory not updating the mount table or
filehandle table.

FOR INFO on lsof goto:
http://www.akadia.com/services/lsof_intro.html

Good luck:

Re: Mount problem

Hemmetter — Wed, 08 Nov 2006 03:08:04 GMT

Hi hangyu,

Maybe your filesystem is shared by nfs?

This will keep your fs busy but wil NOT show in fuser/lsof as nfsd is a linux kernel daemon.

TRy to
$ exportfs -u "your-fs"
and umount again.

rgds
HGH

Re: Mount problem

Sanjay Yugal Kishore Ha — Wed, 08 Nov 2006 03:38:52 GMT

Hello hangyu,

There might be mount points below /Ora1 (most probably NFS) that are in use. Use the mount command to search for "/Ora1" entries and and if the mount points are NFS of AutoFS, then turn off the automounter before retrying the mount.

Don't forget to turn on the automounter once the mount command is successful.

HTH,
Sanjay

Re: Mount problem

Yogeeraj_1 — Wed, 08 Nov 2006 06:05:16 GMT

hi,

try the following:

dmsetup remove_all; sleep 10; mount /dev/sda1 /Ora1

kind regards
yogeeraj