High IO Load in DIA0 Trace Though IO Load Not High

(Doc ID 1915870.1)

Last updated on AUGUST 01, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 to 12.1.0.2 [Release 11.2 to 12.1]
Information in this document applies to any platform.

Symptoms

Exadata Full rack cluster connected to ZFSSA appliance.

DIA0 trace shows the below messages after database upgrade :-

*** 2014-03-18 13:42:31.343
HM: IO load was high but is now below abnormal levels. (0x0) (0)
 

*** 2014-03-18 13:44:02.385
HM: IO load is abnormally high. (0x600) (17)
 

*** 2014-03-18 13:51:07.628
HM: IO load was high but is now below abnormal levels. (0x0) (12)
 

*** 2014-03-18 13:51:37.897
HM: IO load is abnormally high. (0x600) (21)
 

*** 2014-03-18 13:57:11.833
HM: IO load was high but is now below abnormal levels. (0x0) (4)
 

*** 2014-03-18 14:05:32.655
HM: IO load is abnormally high. (0x600) (26)

 

Support Bundle collected referring Note 1019887.1 - Sun Storage 7000 Unified Storage System: How to Collect a Support Bundle using the BUI or CLI.

Support Bundle did not show high IO / disk saturation.

Changes

 Database upgraded from 11.2.0.2 to 11.2.0.4.

Cause

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