Lustre 1.6 Operations Manual

24.2 Using Quotas
The lfs quota command displays disk usage and quotas. By default, only user
quotas are displayed (or with the -u flag).
A root user can use the -u flag, with the optional user parameter, to view the limits
of other users. Users without root user authority can use the -g flag, with the
optional group parameter, to view the limits of groups of which they are members.
Note – If a user has no files in a filesystem on which they have a quota, the lfs
quota command shows quota: none for the user. The user's actual quota is
displayed when the user has files in the filesystem.
Examples
To display quotas as user “bob,” run:
$ lfs quota -u /mnt/lustre
The above command displays disk usage and limits for user "bob."
To display quotas as root user for user “bob,” run:
$ lfs quota -u bob /mnt/lustre
The system can also show the below information about disk usage by “bob.”
To display your group's quota as “tom”:
$ lfs -g tom /mnt/lustre
To display the group's quota of “tom”:
$ lfs quota -g tom /mnt/lustre
Note – As for ext3, Lustre makes a sparse file in case you truncate at an offset past
the end of the file. Space is utilized in the filesystem only when you actually write
the data to these blocks.
24-4 Lustre 1.6 Operations Manual • September 2008