Jul 092008
 

Before attempting to dismount a filesystem, it must be inactive. If “any user” has one of the filesystem’s directories as their current directory or has any file within the filesystem open, you will receive an error message, like the one below, when attempting to unmount the filesystem:

# umount /dev/dsk/c0t2d0s7
umount: /dev/dsk/c0t2d0s7: device is busy

Well, the fuser command to the rescue. The fuser command may be used to determine which files or directories within a filesystem are currently in use and to identify the processes and users that are using them.

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Jul 092008
 

To understand how you got into this state, see EXT2-fs: warning: mounting unchecked file system.
Remount it. If /etc/fstab is correct, you can simply type:

# mount -n -o remount / 

If /etc/fstab is wrong, you must give the device name and possibly the type, too: e.g.

# mount -n -o remount -t ext2 /dev/hda2 /