Using a quota, you can allocate the maximum amount of disk space a user or group may use. It can be flexible in its adherence to the rules assigned and is applied per file system.
Quotas can be configured for users and groups on a file system or a virtual volume. Default quotas can be set for users and groups, and these defaults apply when specific quotas are not defined for users or groups in a file system or a virtual volume.
Quotas are also configured to limit the total size of a virtual volume. User or group quotas configured at the file system level can be different from the quotas configured at the virtual volume level.