Volume Usage Limits

Volume usage limits determine how much of a volume can be consumed before an alert is sent to the administrator. When the usage limit is reached, the performance policy associated with the volume determines the next action (for example, whether to make the volume read-only or take the volume offline). An alert is also sent.

Thickly-provisioned volumes have a default volume limit of 100 percent. For thinly-provisioned volumes, you can set the volume limit to a value between 0 and 100 percent. Some applications do not tolerate changes to volume sizes. Limits address this issue. Volume limits let you set a limit but leave room in case more space is needed.

For example, if you have an application that you do not want to fill all the space on the volume before more space is available for expansion, set a limit for the volume. You now have a safety factor, and when the limit is met, you can reset the limit, giving more space to the application. You can then plan for further expansion if necessary.

If the volume is approaching the limit, an event is logged. If enforcement is enabled, the administrator can access the system log to determine what follow-up actions to take, such as preventing the user from accessing more disk space or allocating additional disk space to the user.