topic Re: cannot umount filesystem (challenging one) in Operating System - HP-UX

cannot umount filesystem (challenging one)

Kenny Soward — Mon, 23 May 2005 08:50:23 GMT

I did something really stupid. I have an Unix 11.11 box. We have sapdatas mounted under /oracle//.

We received a validation error that /oracle/ was not mounted (which needs to be in our environment) and I went about trying to "fix" it.

I tried to follow a CBA we have for doing this. I
1) mv /oracle/ /oracle/.tmp
2) Created a new logical volume with the lvcreate command named after the original..
3) Perform newfs on the logical volume.
4) Mount old directory to new logical volume.
5) Copy the data from /oracle/.temp to new /oracle/ location.
Example:
find /oracle/.temp -xdev -depth -print | cpio -pxdm /oracle/
6) Removed /oracle/.tmp

My mistake was that I didn't umount anything prior to doing these steps. Bdfs showed the filesysems are mounted very strangely now.

# bdf /oracle/NPA/sapreorg
Filesystem kbytes used avail %used Mounted on
/dev/vg_apps/lv_oracle
524288 77629 418814 16% /oracle

This should be mounted on /dev/vg_NPA_lv_reorg.

I cannot unmount anything under /oracle/NPA now.

# umount /oracle/NPA/sapreorg
umount: cannot unmount /oracle/NPA/sapreorg : Block device required
umount: return error 1.

The customer said I can blow these filesystems away as they are "test" but I cannot get them unmounted.

Any ideas for this challenging issue?

Re: cannot umount filesystem (challenging one)

Simon Hargrave — Mon, 23 May 2005 08:57:28 GMT

Have you tried recreating mnttab?

# mv /etc/mnttab /etc/mnttab.bak
# mount

Re: cannot umount filesystem (challenging one)

Walter Pisani — Mon, 23 May 2005 09:00:50 GMT

Hi,

The mountpoint is /oracle

Correct Syntax:
# unmount /oracle

Walter

Re: cannot umount filesystem (challenging one)

Bharat Katkar — Mon, 23 May 2005 09:03:55 GMT

Hi,

Did you try "umount /oracle" !!!
Regards,

Re: cannot umount filesystem (challenging one)

Kenny Soward — Mon, 23 May 2005 09:11:57 GMT

Hi all. Thanks for the replies. Yes, I did try to rebuild mnttab using the above method with no luck.

Also, I would try to umount /oracle but there are some other running that are mounted beneath that.

I think the only way I'll be able to remedy this issue is get a reboot for this server.

Re: cannot umount filesystem (challenging one)

Devesh Pant_1 — Thu, 26 May 2005 23:07:21 GMT

Did you try fuser -k on the /oracle ?
Devesh

Re: cannot umount filesystem (challenging one)

Muthukumar_5 — Fri, 27 May 2005 01:52:54 GMT

If some user is entered into the mounted directory or using files located in it, then you can not umount it.

Try to check fuser -k /oracle to get user who is using that file system. Else directly make a message to that users as "who is using /oracle directoy. please out of that directory".

Or login as root and kill all user process by who -u except your's and unmount it.

hth.

Re: cannot umount filesystem (challenging one)

Dave Hutton — Fri, 27 May 2005 07:51:06 GMT

Personally I like to
#fuser -u /mountpoint

First, just because I like to see what processes it thinks is using that filesystem.
If you want you can kill the pids by hand or use the command above
#fuser -k /mountpoint.

I've seen cases where that comes back without any pids showing up. Then I usually go against the lvol.
#fuser -u /dev/vgXX/lvolXX

Then you should hopefully be able to
#umount /mountpoint