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I/O Tests on Oracle VM Guests Show High util% & %iowait with Low SAN Utilization (Doc ID 1270394.1)

Last updated on FEBRUARY 01, 2019

Applies to:

Linux OS - Version 2.6 and later
Oracle Cloud Infrastructure - Version N/A 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

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In this Document
Symptoms
Cause
Solution
References


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