AVGQU-SZ or disk utilization very high in iostat or EM Disk Device Busy metric, without corresponding disk activity
Last updated on MARCH 06, 2016
Applies to:Linux OS - Version 2.6.18 to Oracle Linux 5.9 with Unbreakable Enterprise Kernel [2.6.32]
Linux OS - Version Oracle Linux 5.5 to Oracle Linux 5.9 [Release OL5U5 to OL5U9]
This is generally seen when monitoring disk activity with iostat, or when an EM alert is received for Disk Device Busy (%) . For example, sample iostat output would look like:
As can be seen, there are no reads or writes taking place (r/s or w/s) for the device, yet the avgqu-sz is very large with a corresponding 100% utilization.
For an example of the EM alert please see Doc ID 1558550.1 .
Sign In with your My Oracle Support account
Don't have a My Oracle Support account? Click to get started
Million Knowledge Articles and hundreds of Community platforms