How to Verify a File System is Unmounted

To verify that you unmounted a file system or a number of file systems, examine the output from the mount command.

$ mount | grep unmounted-file-system $

How to Stop All Processes Accessing a File System

1. Become superuser or assume an equivalent role.

2. List all the processes that are accessing the file system so that you know which processes you are going to stop.

   # fuser -c [ -u ] /mount-point

   -c	Reports on files that are mount points for file systems and any files within those mounted file systems.
   -u	Displays the user login name for each process ID.
   /mount-point	Specifies the name of the file system for which you want to stop processes.

3. Stop all processes that are accessing the file system.

   # fuser -c -k /mount-point

   A SIGKILL is sent to each process that is using the file system.

   ---

   Note - You should not stop a user's processes without first warning the user.

   ---

4. Verify that there are no processes that are accessing the file system.

   # fuser -c /mount-point

Example--Stopping All Processes Accessing a File System

The following example shows how to stop process 4006c that is using the /export/home file system.

# fuser -c /export/home
/export/home:     4006c
# fuser -c -k /export/home
/export/home:     4006c
# fuser -c /export/home
/export/home: 

How to Unmount a File System

Use the following procedure to unmount a file system, except for the root (/), /usr, or /var file systems.

Note - The root (/), /usr, and /var file systems can be unmounted only during a shutdown, since the system needs these file systems to function.

1. Make sure that you have met the prerequisites listed in "Prerequisites for Unmounting File Systems".

2. Unmount the file system.

   # umount /mount-point

   /mount-point is the name of the file system that you want to unmount. This can be one of the following:

   • The directory name where the file system is mounted

   • The device name path of the file system

   • The resource for an NFS file system

   • The loopback directory for a LOFS file system

Examples--Unmounting a File System

The following example shows how to unmount a local home file system.

# umount /export/home

The following example shows how to unmount the file system on slice 7.

# umount /dev/dsk/c0t0d0s7

The following example shows how to forcibly unmount the /export file system.

# umount -f /export
# 

The following example shows how to unmount all file systems in the /etc/vfstab file, except for the root (/), /proc, /var, and /usr file systems.

# umountall

All file systems are unmounted, except for those file systems that are busy.