Linux Disk Quota

Disk Quotas: This feature of Linux allows the system administrator to allocate a 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 filesystem. The default Linux Kernel which comes with Redhat and Fedora Core comes with quota support compiled in.

Two versions of quotas have been released. Version 2 is used by the Linux 2.4 and 2.6 kernel. Quotas version 1 is used by the Linux 2.2 kernel.