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3.3. Unmounting a GFS2 File System


GFS2 file systems that have been mounted manually rather than automatically through Pacemaker will not be known to the system when file systems are unmounted at system shutdown. As a result, the GFS2 script will not unmount the GFS2 file system. After the GFS2 shutdown script is run, the standard shutdown process kills off all remaining user processes, including the cluster infrastructure, and tries to unmount the file system. This unmount will fail without the cluster infrastructure and the system will hang.
To prevent the system from hanging when the GFS2 file systems are unmounted, you should do one of the following:
  • Always use Pacemaker to manage the GFS2 file system. For information on configuring a GFS2 file system in a Pacemaker cluster, see Chapter 5, Configuring a GFS2 File System in a Cluster.
  • If a GFS2 file system has been mounted manually with the mount command, be sure to unmount the file system manually with the umount command before rebooting or shutting down the system.
If your file system hangs while it is being unmounted during system shutdown under these circumstances, perform a hardware reboot. It is unlikely that any data will be lost since the file system is synced earlier in the shutdown process.
The GFS2 file system can be unmounted the same way as any Linux file system, by using the umount command.

Note

The umount command is a Linux system command. Information about this command can be found in the Linux umount command man pages.

Usage

umount MountPoint
MountPoint
Specifies the directory where the GFS2 file system is currently mounted.
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