Administrator Guide

Managing Quota Rules
Quota rules allow you to control the amount of NAS volume space a user or group can utilize. Quotas are congured on a per NAS
volume basis.
When a user reaches a specied portion of the quota size (soft quota limit) an alert is sent to the storage administrator. When the
maximum quota size (hard quota limit) is reached, users cannot write data to the SMB shares and NFS exports on the NAS volume,
but no alert is generated.
Quota Types
The following quota types are available:
• Specic user quota: This quota applies only to the user. Example: A user named Karla is given a 10 GB quota.
• Each user in a specic group: This quota applies to each user that belongs to the group. Example: Three users named Karla,
Tim, and Jane belong to the Administrators group. Each user in this group is given a 10 GB quota.
• Quota for an entire group: This quota applies to all users in the group collectively. Example: Three users named Karla, Tim,
and Jane belong to the Administrators group. This group is collectively given a 10 GB quota, so the total combined space
used by the three users cannot exceed 10 GB. If, for example Karla uses 7 GB, and Tim uses 2 GB, Jane can use only 1 GB.
• Default per user quota: This quota applied to users for which no other quota is dened. A specic quota for a user always
overrides the default user quota. Example: Users with no other quota are given a 10 GB quota.
• Default per group quota: This quota applies to groups for which no other quota is dened. A specic quota for a group always
overrides the default group quota. Example: Groups with no other quota are given a 10 GB quota, so the total combined space
used by each user in a group cannot exceed 10 GB.
• Quota directory: A quota‑based directory is a special type of directory that accounts for the logical size of all its subles and
subdirectories. This feature enables administrators to mark an empty directory as a quota directory in order to limit the amount of
total space within a NAS volume that the directory can use. This quota can be useful for project directories that are used by
diverse users.
User and Group Quotas
For UNIX les, quotas apply to le users (UID) and group owners (GID). For NTFS les, quotas apply to le owners and their primary
groups. Non-owning users or groups are not subject to quota limitations when they change the size of a le.
Quota charges apply when les change ownership, (for example, by using the chown or chgrp command on UNIX systems or by
changing the le owner on NTFS systems). All previous owners of a le are credited the size of the le, and all new owners of the le
are charged by the same amount.
When a user’s primary group changes, no quota changes are made to the existing charges for the old primary group. The new
primary group is charged for any new les created after the change.
Conicts Between Group Quotas and User Quotas
In the event of a conict between a user's own quota and the per-user quota for the group to which the user belongs, the user
quota overrides the group quota. For example, if you applied a quota of 5 GB to each user in the Administrators group, but also
created a quota of 10 GB for a user named Karla who belongs to the Administrators group, [Karla] is given a 10 GB quota.
Quotas and Mixed Security Style NAS Volumes
For NAS volumes with the mixed security style, a unique quota must be set for both the Windows (Active Directory) users, and UNIX
or Linux users (LDAP or NIS). The quotas for the Windows and UNIX or Linux users are independent of each other even if the users
are mapped (automatically or manually). For NAS volumes with NTFS or UNIX security style permissions, only one unique quota
must be set. The user mapping functionality takes care of the cross-protocol interoperability. The Windows and UNIX or Linux users
share the same quota for both the Windows and UNIX or Linux accounts that are mapped.
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FluidFS NAS Volumes, Shares, and Exports