S-Series f/w 7.03.03.0001 displays alternating Environmental Temperature Hot / Normal messages

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Article ID: 13226 

Products
S-Series, firmware 7.01.03.0004 through 7.03.06.0004

Symptoms
The system logs "hot" messages, then "normal" messages a short time later.

Here is the syslog output ('show logging buffer') - in ascending sequence - from an affected system:
<163>Jun 15 10:41:14 10.21.31.2 System[3]Environmental temperature is hot.
<163>Jun 15 10:41:24 10.21.31.2 System[3]Environmental temperature is normal.
<163>Jun 19 07:51:18 10.21.31.2 System[3]Environmental temperature is hot.
<163>Jun 19 07:51:28 10.21.31.2 System[3]Environmental temperature is normal.
<163>Jun 22 17:41:20 10.21.31.2 System[3]Environmental temperature is hot.
<163>Jun 22 17:41:30 10.21.31.2 System[3]Environmental temperature is normal.
<163>Jun 25 00:22:40 10.21.31.2 System[3]Environmental temperature is hot.
<163>Jun 25 00:22:50 10.21.31.2 System[3]Environmental temperature is normal.
<163>Jun 25 08:51:13 10.21.31.2 System[3]Environmental temperature is hot.
<163>Jun 25 08:51:23 10.21.31.2 System[3]Environmental temperature is normal.
<163>Jun 28 20:40:14 10.21.31.2 System[3]Environmental temperature is hot.
<163>Jun 28 20:40:24 10.21.31.2 System[3]Environmental temperature is normal.
<163>Jun 29 13:32:37 10.21.31.2 System[3]Environmental temperature is hot.
<163>Jun 29 13:32:47 10.21.31.2 System[3]Environmental temperature is normal.

Here is the fault log output ('show support') - in descending sequence - from the same system:
==============================================================================
Message 1/43 Syslog Message 07.03.03.0001 06/29/2010 13:32:47
<3>System[3]Environmental temperature is normal.

==============================================================================
Message 2/43 Syslog Message 07.03.03.0001 06/29/2010 13:32:37
<3>System[3]Environmental temperature is hot.

==============================================================================
Message 3/43 Syslog Message 07.03.03.0001 06/28/2010 20:40:24
<3>System[3]Environmental temperature is normal.

==============================================================================
Message 4/43 Syslog Message 07.03.03.0001 06/28/2010 20:40:14
<3>System[3]Environmental temperature is hot.

==============================================================================
Message 5/43 Syslog Message 07.03.03.0001 06/25/2010 08:51:23
<3>System[3]Environmental temperature is normal.

==============================================================================
Message 6/43 Syslog Message 07.03.03.0001 06/25/2010 08:51:13
<3>System[3]Environmental temperature is hot.

==============================================================================
Message 7/43 Syslog Message 07.03.03.0001 06/25/2010 00:22:50
<3>System[3]Environmental temperature is normal.

==============================================================================
Message 8/43 Syslog Message 07.03.03.0001 06/25/2010 00:22:40
<3>System[3]Environmental temperature is hot.

==============================================================================
Message 9/43 Syslog Message 07.03.03.0001 06/22/2010 17:41:30
<3>System[3]Environmental temperature is normal.

==============================================================================
Message 10/43 Syslog Message 07.03.03.0001 06/22/2010 17:41:20
<3>System[3]Environmental temperature is hot.

==============================================================================
Message 11/43 Syslog Message 07.03.03.0001 06/19/2010 07:51:28
<3>System[3]Environmental temperature is normal.

==============================================================================
Message 12/43 Syslog Message 07.03.03.0001 06/19/2010 07:51:18
<3>System[3]Environmental temperature is hot.

==============================================================================
Message 13/43 Syslog Message 07.03.03.0001 06/15/2010 10:41:24
<3>System[3]Environmental temperature is normal.

==============================================================================
Message 14/43 Syslog Message 07.03.03.0001 06/15/2010 10:41:14
<3>System[3]Environmental temperature is hot.

==============================================================================

Cause
These are false positive readings, when no actual over-temp condition exists.

Solution/Workaround
Upgrade to firmware 7.11.01.0026 or higher.
Release notes state, in the 'Firmware Changes and Enhancements' section:
Management
Incorrect data read from the temperature sensor device may produce intermittent warning messages regarding environmental temperatures. Inaccurate warning messages similar to "<3>System[3]Environmental temperature is hot." may occur followed 10 seconds later by a messages similar to "<3>System[3]Environmental temperature is normal."

Pre-upgrade workaround:
Such rapidly-correcting "hot" messages may be safely ignored.
Messages that do not appear to be self-correcting should be investigated further, by using the 'show system hardware' command to view the underlying board temperature readings (13189).
Contact the GTAC for assistance, as necessary.
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