This metric shows the sum of all disk I/O for all disks. The data is not aggregated for all instances.
The rest of the information in this section is only valid for this metric when it appears in either the Enterprise Manager Grid Control or the Enterprise Manager Database Control (if applicable).
The following table shows how often the metric's value is collected.
Target Version |
Collection Frequency |
10.1.0.x; 10.2.0.x; 11.1.0.x; 11.2.0.x |
Every 15 Minutes |
It is calculated using the Instance Disk Performance metric which in turn collects data from the GV$ASM_DISKGROUP and GV$ASM_DISK views for 10g Release 1 and the GV$ASM_DISKGROUP_STAT and GV$ASM_DISK_STAT views for 10g Release 2.
To calculate the average I/O size of each disk, the total number of bytes read and written is divided by the total number of I/Os during the collection interval. The data is displayed for all instances that are part of the cluster.
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Related Topics
About Alerts
About the Metric Detail Page
Editing Thresholds
Understanding Line Charts
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