I/O Tests on Oracle VM Guests Show High util% & %iowait with Low SAN Utilization

(Doc ID 1270394.1)

Last updated on MARCH 08, 2017

Applies to:

Linux OS - Version 2.6 and later
Generic Linux
***Checked for relevance on 01-Jul-2013***

Symptoms

While trying to evaluate Oracle Database performance running in an Oracle VM guest with shared SAN environment, performing I/O tests in Oracle VM guests using:

generally shows:

and the utilization monitor of SAN (shared disk) does not show much utilization. Comparison with tests on Oracle VM management domain (dom0) is generally inconsistent too. The results seem to show that the performance is bad or at least unreliable.

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms