IO Throughput

Description

This metric shows the I/O throughput detail of a volume in a cluster. The data is aggregated for all instances that are part of the cluster. This gives an indication of the volume I/O performance in terms of reads and writes.

Metric Summary

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

All Versions

Every 15 Minutes

Data Source

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 throughput of each volume, the total number of bytes read and written is divided by the total I/O time during the collection interval. The data is aggregated for all instances that are part of the cluster.

User Action

No user action is required.

Related Topics

About Alerts

About the Metric Detail Page

Editing Thresholds

Understanding Line Charts