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.
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 |
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.
No user action is required.
Related Topics
About Alerts
About the Metric Detail Page
Editing Thresholds
Understanding Line Charts
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.