Suspending Activity On A File System - Red Hat ENTERPRISE LINUX 4 - GLOBAL FILE SYTEM Manual

By using the gettune flag of the gfs_tool command, all current tunable parameters including
atime_quantum (default is 3600 seconds) are displayed.
The gfs_tool settune command is used to change the atime_quantum parameter value. It must
be set on each node and each time the file system is mounted. (The setting is not persistent across
unmounts.)
Usage
Displaying Tunable Parameters
gfs_tool gettune MountPoint
MountPoint
Specifies the directory where the GFS file system is mounted.
Changing the atime_quantum Parameter Value
gfs_tool settune MountPoint atime_quantum Seconds
MountPoint
Specifies the directory where the GFS file system is mounted.
Seconds
Specifies the update period in seconds.
Examples
In this example, all GFS tunable parameters for the file system on the mount point /gfs1 are
displayed.
gfs_tool gettune /gfs1
In this example, the atime update period is set to once a day (86,400 seconds) for the GFS file
system on mount point /gfs1.
gfs_tool settune /gfs1 atime_quantum 86400

4.10. Suspending Activity on a File System

You can suspend write activity to a file system by using the gfs_tool freeze command.
Suspending write activity allows hardware-based device snapshots to be used to capture the file
system in a consistent state. The gfs_tool unfreeze command ends the suspension.
Usage
Start Suspension
Suspending Activity on a File System
31