This metric shows the sum of disks I/O performance per second in terms of total I/O requests for all the disks. The data is displayed for all instances that are part of the cluster.
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.
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/Os per second for each disk, the total number of I/O responses is divided by the total I/O time during the collection interval. The data is displayed for all instances that are part of the cluster.
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About the Metric Detail Page
Understanding Line Charts
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