This metric shows the space used by all the disk groups having the state as ‘MOUNTED’. This metric is used to collect information about the disk usage and is used to show the trend of disk group space usage in the application. This is used to determine the following metrics: Free MB, Total MB, Total Safely Usable MB, Type, Safely Usable File MB, Used %, and Used % of Safely Usable of a disk group for 10g Release 2 and Free MB, Total MB, Type, and Used % for 10g Release 1.
This metric generates a warning alert if the disk group is 75% used and a critical warning if 90% used. The thresholds for the Disk Group Usage alert should not be fixed at 75% and 90%, since the value depends on the redundancy. In version 10g Release 2, the metric uses the USABLE_FILE_MB column of the V$ASM_DISKGROUP_STAT view to indicate usable mirrored free space. This column displays the amount of free space that can be safely utilized taking mirroring into account, and yet is able to restore redundancy after disk failure.
Enterprise Manager issues alerts for the following:
Critical alert when USABLE_FILE_MB <= 0
Warning alert when USABLE_FILE_MB < 0.1 * REQUIRED_MIRROR_FREE_MB
This metric is collected at a time interval of 15 minutes. You can change the threshold limit as required.
This metric is collected with the help of a SQL query which queries the V$ASM_DISKGROUP view for 10g Release 1 and the V$ASM_DISKGROUP_STAT view for 10g Release 2.
Copyright © 1996, 2009, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its affiliates.
Other names may be trademarks of their respective owners.