Erroneous Upper and Lower Non-critical voltage errors in SEL log

Asset ID:	1-72-1515601.1
Update Date:	2013-07-03
Keywords:

Solution Type Problem Resolution Sure

Solution 1515601.1 : Erroneous Upper and Lower Non-critical voltage errors in SEL log

Applies to:

Sun Fire X4140 Server - Version Not Applicable to Not Applicable [Release N/A]
Sun Fire X4240 Server - Version Not Applicable to Not Applicable [Release N/A]
Sun Fire X4440 Server - Version Not Applicable to Not Applicable [Release N/A]
Information in this document applies to any platform.

Symptoms

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In the presence of this issue you will see false MB voltage errors in the SEL. Errors such as these would most likely cause the system to fail, panic, reboot, fail to complete POST, or to fail to boot at all. However, the systems showing these SEL errors are running normal with no issues.

There may be several of these false errors in the SEL over time which may lead to believe components need replaced when they do not.

Here are some examples of errors:

a0 | 06/06/2010 | 07:37:32 | Voltage MB/P0/V_+0V9 | Lower Non-critical going low | Reading 0.44 < Threshold 0.80 Volts
a1 | 06/06/2010 | 07:37:39 | Voltage MB/P0/V_+0V9 | Lower Non-critical going high | Reading 0.90 > Threshold 0.80 Volts
a2 | 06/06/2010 | 07:38:50 | Voltage MB/P0/V_+0V9 | Lower Non-critical going low | Reading 0.44 < Threshold 0.80 Volts
a3 | 06/06/2010 | 07:38:57 | Voltage MB/P0/V_+0V9 | Lower Non-critical going high | Reading 0.90 > Threshold 0.80 Volts
a4 | 06/08/2010 | 15:19:07 | Voltage MB/V_+3V3STBY | Lower Non-critical going low | Reading 2.75 < Threshold 3.01 Volts
a5 | 06/08/2010 | 15:19:13 | Voltage MB/V_+3V3STBY | Lower Non-critical going high | Reading 3.29 > Threshold 3.01 Volts
a6 | 06/08/2010 | 15:22:48 | Voltage MB/P0/V_+0V9 | Upper Non-critical going high | Reading 1.21 > Threshold 1.01 Volts
a7 | 06/08/2010 | 15:22:57 | Voltage MB/P0/V_+0V9 | Upper Non-critical going low | Reading 0.90 < Threshold 1.01 Volts

Cause

Those abnormal readings are caused by glitches during I2C bus reading.

Bug 15649857 : SUNBT6961219 X4440 SHOWING ERRONEOUS VOLTAGE ERRORS IN SEL LOG

Solution

This issue has been resolved with firmware release SW3.2.1

See https://support.oracle.com/handbook_private/General/x86_patch.html

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