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Offloaded smart scan performance is incorrectly throttled on Extreme Flash storage servers (Doc ID 2619367.1)

Last updated on DECEMBER 18, 2019

Applies to:

Oracle Exadata Storage Server Software - Version 18.1.0.0.0 and later
Information in this document applies to any platform.

Symptoms

Due to bug 30492121, large I/Os on Extreme Flash storage servers are incorrectly throttled, which can result in significant performance impact to smart scan throughput.  To determine if you are experiencing this issue, run script metric_iorm.pl from <Document 1337265.1> on each storage server to identify if all storage servers are experiencing large I/O queue waits greater than 10ms.

For example, the following dcli command will run metric_iorm.pl on each storage server and show cases where Large I/O queue time exceeds 10ms.

 

Cause

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In this Document
Symptoms
Cause
Solution
 Workaround
 Implement the workaround
 Remove the workaround

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