Dell PowerVault ME5 Series Administrator's Guide

Changing pool settings

Each virtual pool has three thresholds for page allocation as a percentage of pool capacity. You can set the low and middle thresholds. The high threshold is automatically calculated based on the available capacity of the pool minus 200 GB of reserved space.

You can view and change settings that govern the operation of each virtual pool from the pools panel (Maintenance > Storage): To see information about disk groups in a pool, expand the row. To change pool settings, click the icon in the pool row. Options include:

• Low Threshold—When this percentage of virtual pool capacity has been used, the system will generate an alert and informational event 462 to notify the administrator. This value must be less than or equal to the Middle Threshold value. The default is 50%.
• Middle Threshold—When this percentage of virtual pool capacity has been used, the system will generate an alert and event 462 to notify the administrator to add capacity to the pool. This value must be between the Low Threshold and High Threshold values. The default is 75%. If the pool is not overcommitted, the alert will have Informational severity. If the pool is overcommitted, the alert will have Warning severity.
• High Threshold—When this percentage of virtual pool capacity has been used, the system will generate an alert and event 462 to alert the administrator to add capacity to the pool. This value is automatically calculated based on the available capacity of the pool minus 200 GB of reserved space. If the pool is not overcommitted, the alert will have Informational severity. If the pool is overcommitted, the alert will have Warning severity and the system will use write-through cache mode until virtual pool usage drops back below this threshold.
• Pool Overcommit—This check box controls whether overcommitting is enabled, and whether storage-pool capacity may exceed the physical capacity of disks in the system. For information about overcommitting, Overcommitting volumes.

To check if the pool is overcommitted, go to Maintenance > Storage, then expand the pool row. If the Pool Overcommitted value is True, the pool is overcommitted. If the value is False, the pool is not overcommitted.