Unable to umount the /dvdrom

[Delecole]

Hi there !

i'm installing an application on a L1000 machine with a DVD.
I have mounted the dvd with :
/etc/mount -F cdfs -o rr /dev/dsk/dvdrom /dvdrom

... installed the application, which did reboot the machine.

Once the application is installed, I try to umount the drive, but getting the following error :

# /etc/umount /dvdrom
umount: cannot unmount /dvdrom : Device busy
umount: return error 1.


- I think the problem is only appearing when the machine reboots with a CD inside of the Drive.
- I can't fins any process using the /dvdrom anymore ...

the only solution (That I want to avoid, is to reboot the server.

Anybody has an idea ?
Many Thanks !

[Peter Godron]

Hi,
have you tried:
cd /
fuser -cuk /dvdrom

This will kill any process using the device.

Otherwise you can normally force eject the media, by inserting a paperclip into the small eject hole.

[Arunvijai_4]

Hi,

Try with # fuser -ku /dvdrom.

It should kill all the processes using /dvdrom

-Arun

[Delecole]

thanks guys !!
I'll try this and let you know !

[Delecole]

PC ... instead of killing ... before killing, is it possible to see the process that uses /dvdrom ?

[Pete Randall]

Sure, just don't use the "-k" switch.


Pete

[Torsten.]

fuser without "-k" or lsof

[RAC_1]

fsuer may not report it, but lsof will.
lsof /dev/dvdrom

[Bill Hassell]

Note that there is no /etc/umount command. It is actually a temporary transition link which is provided so administrators can fix all their old code and habits. Use the command:

ll -d /etc/mount

to see the link. The command is /usr/bin/umount or /sbin/umount.

Note also that is any process (perhaps a login shell) does a cd /dvdrom, the device will remain busy forever. It is always recommended not to cd into removable media directories for this reason. Most likely, someone has cd'ed into the /dvdrom directory.

[Delecole]

Perhaps, yes ... but even if I "cd" back to /, the device stays busy then ?

[Bill Hassell]

If any user cd's to /dvdrom, then the mountpoint will be busy. Do you have /dvdrom listed in /etc/fstab? If so, add the option noauto to the cdfs flags, something like:

/dev/dsk/c0t2d0 /dvdrom cdfs ro,noauto 0 0

Now the CD won't be automatically mounted but can be mounted and umounted as needed. The only way you will find the culprit is to download lsof. It will find the process that is keeping this mountpoint open.

[Chan 007]

Hi

If you installed it and you have not come out of the session, just logout this may kill your open process and you can get rid of this problem.

Chan