Installation guide

system blocks, respectively.

User

A user name or ID to which the data is associated.

Group

A group name or ID to which the data is associated.

LimitSize

The hard limit set for the user or group. This value is zero if no limit has been set.

Value

The actual amount of disk space used by the user or group.

Comments

When displaying quota information, the gfs_quota command does not resolve UIDs and GIDs

into names if the -n option is added to the command line.

Space allocated to GFS's hidden files can be left out of displayed values for the root UID and

GID by adding the -d option to the command line. This is useful when trying to match the num-

bers from gfs_quota with the results of a du command.

Examples

This example displays quota information for all users and groups that have a limit set or are us-

ing any disk space on file system /gfs.

gfs_quota list -f /gfs

This example displays quota information in sectors for group users on file system /gfs.

gfs_quota get -g users -f /gfs -s

4.3. Synchronizing Quotas

GFS stores all quota information in its own internal file on disk. A GFS node does not update

this quota file for every file-system write; rather, it updates the quota file once every 60 seconds.

This is necessary to avoid contention among nodes writing to the quota file, which would cause

a slowdown in performance.

As a user or group approaches their quota limit, GFS dynamically reduces the time between its

quota-file updates to prevent the limit from being exceeded. The normal time period between

quota synchronizations is a tunable parameter, quota_quantum, and can be changed using the

gfs_tool command. By default, the time period is 60 seconds. Also, the quota_quantum paramet-

er must be set on each node and each time the file system is mounted. (Changes to the

quota_quantum parameter are not persistent across unmounts.)

You can use the gfs_quota sync command to synchronize the quota information from a node to

the on-disk quota file between the automatic updates performed by GFS.

4.3. Synchronizing Quotas