Unmounts a previously mounted file system, directory, or file.
{ unmount | umount } [ -f ] [ -a ] | [ all | allr | Device | Directory | File | FileSystem | -n Node | -t Type ]
Another name for the umount command is the unmount command. Either name can be used. You can use the System Management Interface Tool (SMIT) to run this command. To use SMIT, enter:
smit umount
The umount command unmounts a previously mounted device, directory, file, or file system. Processing on the file system, directory, or file completes and it is unmounted. Members of the system group and users operating with root user authority can issue any umount command. Only users with root authority or are members of the system group can unmount a directory or file.
Note: SMIT will not unmount the /usr/lpp/info/$LANG directory, the directory on which SMIT helps are located. Typically, this is the CD-ROM.
To unmount local mounts you can specify the device, directory, file, or file system on which it is mounted.
If the file system being unmounted is a JFS2 snapshot, the umount command will unmount the snapshot, though the snapshot will still be active. The snapshot command must be used to delete the snapshot.
If the file system being unmounted is a snapped file system with mounted snapshots, the umount command displays a warning that there are mounted snapshots and exits without unmounting the file system. The snapshots must be unmounted first.
| -a | Unmounts all mounted file systems. |
| all | Unmounts all mounted file systems. |
| allr | Unmounts all remotely mounted file systems.
Note: For remote mounts, specify the device, directory, file, or file system parameters. If you specify the allr flag, the umount command unmounts all remote mounts. |
| -f | Forces an unmount in a remote environment. Use to free a client
when the server is down and server path names cannot be resolved, or when
a filesystem must be unmounted while it is still in use. The -f flag is not supported for journaled file systems.
Note
For remote filesystems, using this flag will cause all file operations besides close() and unmap() on the filesystem
to fail. Outstanding write operations that have not yet been sent to the server
will be lost, even for hard mounts. Because of this, forcing an unmount can
cause data integrity failure and should be used with caution. |
| -n Node | Specifies the node holding the mounted directory you want to unmount. The umount -n Node command unmounts all remote mounts made from the Node parameter. |
| -t Type | Unmounts all stanzas in the /etc/filesystems file that contain the type=Type flag and are mounted. The Type parameter is a string value, such as the remote value that specifies the name of the group. |
Note: You cannot use the umount command on a device in use. A device is in use if any file is open for any reason or if a user's current directory is on that device.
| /etc/filesystems | Lists the known file systems and defines their characteristics. |
The cdcheck command, cdeject command, cdmount command, cdromd command, cdumount command, cdutil command, mount command, fuser command.
The mount subroutine, umount subroutine, vmount subroutine, uvmount subroutine, mntctl subroutine.
The System Management Interface Tool (SMIT) in AIX 5L Version 5.2 System Management Concepts: Operating System and Devices explains the structure, main menus, and tasks that are done with SMIT.
The Mounting Overview in AIX 5L Version 5.2 System Management Concepts: Operating System and Devices explains mounting files and directories, mount points, and automatic mounts.