Prerequisites

The prerequisites to unmount file systems are:

• You must be superuser.

• A file system must be available for unmounting. You cannot umount a file system that is busy. A file system is considered busy if a user is in a directory in the file system, or if a program has a file open in that file system. You can make a file system available for unmounting by:

  • Changing to a directory in a different file system.

  • Logging out of the system.

  • Using the fuser command to list all processes accessing the file system and to stop them if necessary. See "How to Stop All Processes for a File System" for more details.

    Notify users if you need to unmount a file system they are using.