How to Unmount a File System

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

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

1. Ensure that you have met the prerequisites listed in Prerequisites for Unmounting File Systems.

2. Unmount the file system.

   # umount /mount-point

   where /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 an LOFS file system

Example 18–10 Unmounting a File System

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

# umount /export/home

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

# umount /dev/dsk/c0t0d0s7

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

# umount -f /export
# 

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

# umountall

The following example shows to unmount all ZFS file systems.

# zfs umount -a

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