topic Re: can't umount cdrom in Operating System - Linux

can't umount cdrom

eric_204 — Tue, 23 Dec 2003 01:05:28 GMT

I meet this problem for many times already, could suggest how can I umount the cdrom . thx in advance.

# umount /mnt/cdrom
umount: /mnt/cdrom: device is busy
# lsof /mnt/cdrom
# fuser /mnt/cdrom
/mnt/cdrom:
No process references; use -v for the complete list
# fuser -v /mnt/cdrom

USER PID ACCESS COMMAND
/mnt/cdrom root kernel mount /mnt/cdrom

Re: can't umount cdrom

Alexander Chuzhoy — Tue, 23 Dec 2003 02:30:19 GMT

Did you try: umount -l /mnt/cdrom

Re: can't umount cdrom

Mark Grant — Tue, 23 Dec 2003 02:43:13 GMT

Personally, I think think the "mount -l" option could become more irritating than it's worth.

Do you have an automountin CDROM?

Re: can't umount cdrom

eric_204 — Tue, 23 Dec 2003 02:44:30 GMT

thd , but I tried "-l" , it pop "no such option" , please advise .

Re: can't umount cdrom

Steven E. Protter — Tue, 23 Dec 2003 02:52:50 GMT

reboot the unit, eject the cd while the server/computer is resetting.

The most common cause of this is an open process on the cdrom

In HP-UX the command to break that is fuser -cuk /mount_of_cdrom

9 times out of 10 you terminate yourself in that process.

While doing an install cd /cdrom instead of /cdrom/runInstaller from somewhere else.

That sort of thing.

SEP

Re: can't umount cdrom

Alexander Chuzhoy — Tue, 23 Dec 2003 02:57:10 GMT

Does the "eject" command works?

Re: can't umount cdrom

eric_204 — Tue, 23 Dec 2003 04:22:47 GMT

thx reply , the command "eject" is not work in my case . On the other hand , except reboot the server , what can I do ? thx.

Re: can't umount cdrom

eric_204 — Tue, 23 Dec 2003 05:19:26 GMT

I don't want to reboot the system , is there other suggestion ? thx.

Re: can't umount cdrom

Cristian Draghici — Tue, 23 Dec 2003 08:18:53 GMT

What if you press the eject button on the CDROM unit?

Is the CD ejected?

Re: can't umount cdrom

K.C. Chan — Tue, 23 Dec 2003 09:18:41 GMT

Have you check to make sure there are no process accessing /mnt/cdrom, try using fuser -u /mnt/cdrom. If there are any processes accessing /mnt/cdrom, you can use fuser -k options to kill it, then try umounting /mnt/cdrom.

Re: can't umount cdrom

Martin P.J. Zinser — Tue, 23 Dec 2003 10:40:48 GMT

Hello,

first try df to check what is mounted on
/mnt/cdrom . The next would be to check
/etc/fstab if there might be an automount
that just hogs the CD already during startup.

Greetings, Martin

Re: can't umount cdrom

Adam Moody_1 — Wed, 24 Dec 2003 04:53:28 GMT

I've had problems before with automount (or autofsd) grabbing the cdrom and not letting go until a reboot (until I discovered that killing the automount daemon resolved it) - never found out why the automount did this, and it only did this on some CD's.

Also, have you tried ejecting with root?
Closed all user terminals to the server?

Re: can't umount cdrom

Denise Spinger — Wed, 24 Dec 2003 05:27:04 GMT

Try the command:

exportfs -u /dev/cdrom
umount /dev/cdrom

Maybe your cdrom is nfs exported and that is the reason for not umounting.

Good lock.

Deise

Re: can't umount cdrom

Nobody's Hero — Wed, 24 Dec 2003 08:48:52 GMT

Remember, if someone pfs mounted the cdrom like "pfs_mount -o xlat=unix /dev/dsk/cxtxdx /cdrom"

Then you need to pfs_umount /cdrom.
If this is the case, run pfs_umount -c /cdrom
to clear and release cdrom. Make sure pfsd and pfs_mountd are running, they are in /usr/sbin.

If you use pfs_mount you must use pfs_umount. If you use pfs_mount and the use umount, it will lock the cdrom and you must reboot. I've been through this problem a million times.

Re: can't umount cdrom

Bill Maginnis — Tue, 30 Dec 2003 13:57:48 GMT

I've found that if I had Konqueror open and was currently in the /MNT/CDROM directory (or a sub-directory), closed Konqueror, and tried to UMOUNT, I would get the "device is busy" headache. To resolve this I would re-open Konqueror, select a directory other than the /mnt/cdrom, then try the umount, everything would be fine.
If I had MP3s on the mounted CD and the MP3 player software had choked, then I'd have to kill that first and then umount.
Just a thought...
-*-Bill