DST supports using volume, directory, and user quotas features of NSS volumes. However, DST does not have a unified quota system for the two volumes that manages quotas for the combined primary and secondary volumes in a shadow volume pair.
Volume quotas specify how big a volume can grow within a NSS pool. You can set a volume quota on the primary volume, secondary volume, or both volumes in the shadow volume pair. Each quota is enforced independently of the other.
Users of the shadow volume pair can map drives only to the primary volume. They are not aware of the existence of the secondary volume. Users see only the volume quota status for the primary volume. The volume quota information is not presented with a total space usage across both volumes. Users can actually store up to the quota amount set on each of the volumes, where each limit is enforced separately.
When the user has data stored on both the primary and secondary volume, the user sees the amount of space used only on the primary volume, which does not accurately reflect the total of space used on the two volumes.
The administrator can check the combined space available on the shadow volume pair and on each volume separately by using Novell Remote Manager for Linux.
Directory quotas are set on specific directories and specify how much data can reside in that specific directory. You can set a directory quota only on the primary volume. When a secondary volume is in a shadow volume pair, the directory quotas set on it are not enforced. The directory quota is enforced only for the space consumed on the primary volume.
The users can store up to the directory quota amount for the directory on the primary volume, and an unlimited amount up to the maximum volume size on the secondary volume.
Users see only the directory quota status for the primary volume. The directory quota information is not presented with a total for the directory across both volumes.
User quotas are set on specific users and specify how much data a user can store on a specific volume. You can set a user quota for a user on the primary volume, secondary volume, or both volumes in the shadow volume pair. Quotas on each volume are enforced independently of the other.
Users see only the user quota status for the primary volume. The user quota information is not presented with a total space usage across both volumes. Users can actually store up to the user quota amount set on each of the volumes, where each limit is enforced separately.