This metric shows the read throughput detail of a volume created in an Automatic Storage Management (ASM) instance. This gives an indication for the total number of bytes read from the volume in proportion to the total read time for this volume in an instance.
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 |
|
11.2.0.x |
Every 15 Minutes |
It is calculated using the Instance Volume Performance metric which in turn collects data from the GV$ASM_DISKGROUP_STAT and GV$ASM_VOLUME_STAT views.
To calculate the average read throughput of each volume, the total number of bytes read is divided by the total read time during the collection interval. The data is displayed for all instances that are part of the cluster.
No user action is required.
Related Topics
About Alerts
About the Metric Detail Page
Editing Thresholds
Understanding Line Charts
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