TEMP_SENSOR At MB/CMP0/T_TCORE Has Exceeded High Warning Threshold (Sun Netra T2000)

Asset ID:	1-72-1992379.1
Update Date:	2017-07-12
Keywords:

Solution Type Problem Resolution Sure

Solution 1992379.1 : TEMP_SENSOR At MB/CMP0/T_TCORE Has Exceeded High Warning Threshold (Sun Netra T2000)

Applies to:

Sun Netra T2000 Server - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

SC initiating soft host system shutdown due to fault at MB/CMP0/T_BCORE and MB/CMP0/T_TCORE

Messages logged to /var/adm/messages:

Mar 4 00:55:27 myserver SC Alert: [ID 232877 daemon.alert] TEMP_SENSOR at MB/CMP0/T_BCORE has exceeded high warning threshold.
Mar 4 01:00:28 myserver SC Alert: [ID 670251 daemon.alert] TEMP_SENSOR at MB/CMP0/T_TCORE has exceeded high warning threshold.
Mar 4 01:20:09 myserver SC Alert: [ID 629618 daemon.alert] SC initiating soft host system shutdown due to fault at MB/CMP0/T_BCORE.
Mar 4 01:20:19 myserver SC Alert: [ID 222544 daemon.error] SC Request to Power Off Host.

Cause

- Environment - High temperature

- Missing "DIMM/CPU Duct" causing poor CPU cooling

- Reduced air flow due to dust accumulated on the air filter (frontal cover)

Solution

1 - Check and confirm environmental conditions are within requirements as per:

Netra T2000 Server Site Planning Guide
http://docs.oracle.com/cd/E19596-01/819-5842-10/819-5842-10.pdf
Environmental Specifications - pag 2

2 - Inspect and clean or replace, if required, the frontal air filter.

3 - Inspect whether "DIMM/CPU Duct" is correctly installed

You may refer to Service Manual in order to physically locate air filter and "DIMM/CPU Duct":

Ref.: Netra T2000 Server Service Manual
http://docs.oracle.com/cd/E19596-01/819-5841-10/819-5841-10.pdf
4.3 Replacing the DIMM/CPU Duct
5.1 Replacing the Air Filter

There were found evidences of CPU overheating (about 30°C above normal conditions) due to inlet air filter screened by dust:

Before cleanning up the air filter:

sc> showenvironment
...
--------------------------------------------------------------------------------
System Temperatures (Temperatures in Celsius):
--------------------------------------------------------------------------------
Sensor           Status  Temp LowHard LowSoft LowWarn HighWarn HighSoft HighHard
--------------------------------------------------------------------------------
PDB/T_AMB        OK        24    -10      -5       0      58       60       62
PDB/ADT7462_AMB  OK        26    -10      -5       0      58       60       62
MB/T_AMB         OK        36     --      --      --      --       --       --
MB/CMP0/T_TCORE  OK        89    -10      -5       0      95      101      105
MB/CMP0/T_BCORE  OK        89    -10      -5       0      95      101      105
IOBD/IOB/T_CORE  OK        86    -10      -5       0      95      100      105
IOBD/T_AMB       OK        49     --      --      --      --       --       --
--------------------------------------------------------
...

After cleanning up the air filter:

sc> showenvironment
...
--------------------------------------------------------------------------------
System Temperatures (Temperatures in Celsius):
--------------------------------------------------------------------------------
Sensor           Status  Temp LowHard LowSoft LowWarn HighWarn HighSoft HighHard
--------------------------------------------------------------------------------
PDB/T_AMB        OK        23    -10      -5       0      58       60       62
PDB/ADT7462_AMB  OK        24    -10      -5       0      58       60       62
MB/T_AMB         OK        28     --      --      --      --       --       --
MB/CMP0/T_TCORE  OK        56    -10      -5       0      95      101      105    
MB/CMP0/T_BCORE  OK        55    -10      -5       0      95      101      105
IOBD/IOB/T_CORE  OK        53    -10      -5       0      95      100      105
IOBD/T_AMB       OK        33     --      --      --      --       --       --

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