Mount problem

[hangyu]

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

[Patrick Wallek · Accepted solution]

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.

[Rajeev Shukla]

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

[hangyu]

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 .

[Yogeeraj_1]

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

[hangyu]

thx reply ,

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

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

[Frank de Vries]

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:

[Hemmetter]

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

[Sanjay Yugal Kishore Ha]

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

[Yogeeraj_1]

hi,

try the following:

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


kind regards
yogeeraj