Problem to umount cd-rom

[Remko Oosenbrug]

When I try to umount my cd-rom the systems says:

umount: cannot unmount /wocas_cd : Device busy

How can I see what keeps th cd-rom busy?

[Victor BERRIDGE]

use the cmd fuser

[John Palmer]

Try 'fuser -c /wocas_cd'

This will give a list of processes that are using the mountpoint. See man fuser.

[CHRIS_ANORUO]

If you are in the /cdrom directory, it will give you the same error. Do cd and enter to take you to $HOME.

[Bill Hassell · Accepted solution]

There are dozens of ways to keep a CDROMmountpoint open:

- cd to the mountpoint (anyone on the system)
- export the filesystem through NFS
- copying a file
- application has a file open

Of these, only the last two will be accurately reported by fuser. Try fuser pointing to the mountpoint, and then also to the device files. If that still does not show who has the CDROM open, get a copy of lsof (List Open Files) from the Liverpool archives:

http://hpux.connect.org.uk/

At the bottom of that page are links to mirror sites around the world.

[Antoanetta Naghiu]

As it was already said, fuser will help you to see the processes. Check if yourself or someone else is sitting inthat directory.
You have to be root to umount it.

If the cdrom has been mounted using pfs_mount, you have to
#/usr/sbin/pfs_umount /cdrom (or whatever is the cdrom mount point)
If necessary, stop the pfsd and pfs_mountd processes.

[Anthony Goonetilleke]

The easiest thing to do is
#fuser -cuk /cdrom

This should kill all proc's associated with that mount point