Users Guide

More file system features
This chapter includes the following information.
Topics:
• File system quotas
File system quotas
You can track and limit drive space consumption by configuring quotas for file systems at the file system or directory level. You
can enable or disable quotas at any time, but it is recommended that you enable or disable them during non-peak production
hours to avoid impacting file system operations.
NOTE: You cannot enable quotas for read-only file systems.
Types of quotas
There are three types of quotas you can put on a file system.
Table 2. Quota types
Type Description
User Quotas Limits the amount of storage that is consumed by an individual user storing data on
the file system.
Tree Quota
Tree quotas limit the total amount of storage that is consumed on a specific directory
tree. You can use tree quotas to:
● Set storage limits on a project basis. For example, you can establish tree quotas
for a project directory that has multiple users sharing and creating files in it.
● Track directory usage by setting the tree quota hard and soft limits to 0 (zero).
NOTE: If you change the limits for a tree quota, the changes take effect
immediately without disrupting file system operations.
User quota on a quota tree Limits the amount of storage that is consumed by an individual user storing data on
the quota tree.
Quota Limits
Table 3. Hard and Soft Limits
Type Descriptions
Hard A hard limit is an absolute limit on storage usage.
If a hard limit is reached for a user quota on a file system or quota tree, the user cannot write
data to the file system or tree until more space becomes available. If a hard limit is reached
for a quota tree, no user can write data to the tree until more space becomes available.
Soft limit A soft limit is a preferred limit on storage usage.
The user is allowed to use space until a grace period has been reached.
The user is alerted when the soft limit is reached, until the grace period is over. After that, an
out of space condition is reached until the user gets back under the soft limit.
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More file system features 19