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Chapter 4. Managing GFS
directory
with atime updates turned off.
/gfs1
mount -t gfs /dev/vg01/lvol0 /gfs1 -o noatime
9.2. Tune GFS
When
updates are enabled, GFS (by default) only updates them once an hour. The time
atime
quantum is a tunable parameter that can be adjusted using the
Each GFS node updates the access time based on the difference between its system time and
the time recorded in the inode. It is required that system clocks of all GFS nodes in a cluster be
synchronized. If a node's system time is out of synchronization by a significant fraction of the
tunable parameter,
atime_quantum
the frequency of
atime
work loads.
By using the
gettune
(default is 3600 seconds) are displayed.
atime_quantum
The
gfs_tool settune
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
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.
36
Quantum
atime
, then
atime
updates may cause performance degradation in clusters with heavy
flag of the
command, all current tunable parameters including
gfs_tool
command is used to change the
Parameter Value
gfs_tool
updates are written more frequently. Increasing
atime_quantum
command.
parameter value. It
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