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d1l2w3 03-14-2005 11:00 AM

mount / umount problems
sys is 1.7ghz, 512m ram
/dev/hda 160g, /dev/hdb 120g
/dev/hdc is a dual cd/dvd-rw, /dev/hdd is a cd-rw
MDK 10.1, KDE 3.2

/dev/hdb5 / ext3 defaults 1 1
none /dev/pts devpts mode=0620 0 0
/dev/hdc /mnt/cdrom auto umask=0,user,iocharset=iso8859-1,codepage=850,noauto,ro,exec,users,unhide 0 0
/dev/hdd /mnt/cdrom2 auto umask=0,user,iocharset=iso8859-1,codepage=850,noauto,ro,exec,users 0 0
none /mnt/floppy supermount dev=/dev/fd0,fs=ext2:vfat,--,umask=0,iocharset=iso8859-1,sync,codepage=850 0 0
/dev/hda1 /mnt/windows vfat umask=0,iocharset=iso8859-1,codepage=850 0 0
none /proc proc defaults 0 0
/dev/hdb1 swap swap defaults 0 0

[root@localhost don]# umount /mnt/cdrom
umount: /mnt/cdrom: device is busy
umount: /mnt/cdrom: device is busy
[root@localhost don]#
There is no cd or dvd in /dev/hdc.
No program that uses /dev/hdc is open.

When inserting a cd or dvd, 'mount /mnt/cdrom' gives this error.
[root@localhost don]# mount /mnt/cdrom
mount: /dev/hdc already mounted or /mnt/cdrom busy
mount: according to mtab, /dev/hdc is already mounted on /mnt/cdrom

After opening /dev/hdc the first time with a file manager or k3b, I have to reboot to use it again.
When it is mounted, I can open and close the cd/dvd at will.
Any ideas on how to solve this?
Also, is there a way that /dev/hdc is always mounted?
I am the only user on this box so it doesn't matter if it's always mounted.


Valhalla 03-14-2005 11:41 AM

Backup your current fstab and then try setting your /dev/hdc filetype to iso9660, and removing all of your options with the exception of user.

d1l2w3 03-14-2005 12:15 PM

Same as before.
No difference.

In order to use /dev/hdc again the sys has to be rebooted.


Tovad 03-14-2005 12:38 PM

I have the same problem - a solution for me is to use the lazy umount
The fam (file alteration monitor) daemon (famd) sometimes refuse to relaese the cdrom/floppy and can then not unmount - use the umount -l option

Valhalla 03-14-2005 03:16 PM

If it doesn't matter if its always mounted, I suppose you could look into submount, and do it that way. I don't know whats going on though.

d1l2w3 03-14-2005 03:22 PM

The -l option works.
Shutting down and booting up again is over... hopefully.
I'll keep working on it.


RemusX2 03-14-2005 04:23 PM

Another thing you could try is


/sbin/fuser/ -m /mnt/mount point
This will display the PID that is keeping the device from umounting. Then when you get the PID you can kill it with


kill PID
And of course changing mount point with where it's mounted and PID with the corresponding PID to the device.

Hope this helps too =]

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