Fujitsu M10-1, M10-4 and M10-4S High FAN Rotation Speeds Causes Noisy Systems

Asset ID:	1-72-2035857.1
Update Date:	2017-07-25
Keywords:

Solution Type Problem Resolution Sure

Solution 2035857.1 : Fujitsu M10-1, M10-4 and M10-4S High FAN Rotation Speeds Causes Noisy Systems

Applies to:

Fujitsu M10-1 - Version All Versions to All Versions [Release All Releases]
Fujitsu M10-4 - Version All Versions to All Versions [Release All Releases]
Fujitsu M10-4S - Version All Versions to All Versions [Release All Releases]
SPARC

Symptoms

XCP2250 can cause inappropriate FAN speed changes when the environment temperature changes a few degrees

Model

Symptom

M10-1

When a system power on is performed:

(1) System power on may fail due to multiple FAN error detection indicating "FAN Speed too low"

(2) FAN rotation speed might change to high speed (Level-5)

M10-4/M10-4S

(3) FAN rotation speed might change to higher than usual in spite of system power-off state.

Example for M10-1

(1): System power on may fail due to multiple FAN error detection indicating "FAN Speed too low".

The power-on failure can be identified by the following error log.

XSCF> showlogs error

Date: Jan 1 00:00:00 JST 2015
Code: 80000000-0000ff0000ff0000ff-018af0300000000000000000
Status: Alarm Occurred: Jan 1 00:00:00.000 JST 2015
Msg: FAN shortage (power-off started)

XSCF> showlogs error

Date: Jan 1 00:00:00 JST 2015
Code: 80002000-0023010001010000ff-019190220000000000000000
Status: Alarm Occurred: Jan 1 00:00:00.000 JST 2015
FRU: /FAN#0,/MBU
Msg: FAN speed too low

(2): FAN rotation speed might change to high speed (Level-5)

There is no error log or a "FAN speed too low" may be recorded.

XSCF> showlogs error
XSCF>

XSCF> showenvironment Fan
MBU
FAN#0: High speed (Level-5)
      FAN#0: 20454rpm
FAN#1: 16875rpm
FAN#1: High speed (Level-5)
FAN#0: 20224rpm
FAN#1: 17034rpm
      :
      :
FAN#6: High speed (Level-5)
      FAN#0: 21011rpm
      FAN#1: 17589rpm

Example for M10-4/M10-4S:

(3): FAN rotation speed might change to higher than usual in spite of system power-off state.

Jan 1 00:04:55 localhost Event: SCF:High temperature was detected at air inlet. FANs are changed to speed (level-4) mode
Jan 1 01:12:28 localhost Event: SCF:Middle temperature was detected at air inlet. FANs are changed to speed (level-3) mode

XSCF> showenvironment Fan
BB#00
   FANU#0: Low speed (Level-3)
       FAN#0: 14173rpm
       FAN#1: 14516rpm
FANU#1: Low speed (Level-3)
      FAN#0: 14285rpm
      FAN#1: 14248rpm
      :
      :
FANU#4: Low speed (Level-3)
     FAN#0: 14210rpm
     FAN#1: 14248rpm

These conditions can occur when:

M10-1 case:

XCP2250 has been applied, and,
A change in the FAN rotation speed is logged to the event log, and,
When the system ( PPAR ) power-on is performed.

M10-4/M10-4S case:

XCP2250 has been applied, and,
Two or more changes of FAN rotation speed have been logged to the event log with the system in the power-off state.

Note Logged events can be any of the following:

Low temperature was detected at air inlet. FANs are changed to speed (level-1) mode
Low temperature was detected at air inlet. FANs are changed to speed (level-2) mode
Middle temperature was detected at air inlet. FANs are changed to speed (level-3) mode
High temperature was detected at air inlet. FANs are changed to speed (level-4) mode

Changes

Cause

This problem is caused by an XSCF firmware bug introduced by XCP2250.

XSCF firmware changed a level of FAN rotation speed wrongly in spite of domain inactive.

Solution

Recovery:

Temporary relief can be obtained by following these steps:

For M10-1 case:

Perform pseudo replace for all FANs using the replacefru command. Actual replacement is not needed.
Or
Power cycle the system ( unplug and plug ).

M10-4/M10-4S case:

Perform domain power-on and off.
Or
Power cycle the system ( unplug and plug ).

Note: Even after the temporary relief is applied, the issue can reoccur when the conditions listed above are met.

Please apply XCP2260 for a permanent solution for the problem.

References

<NOTE:1554086.1> - Fujitsu M10-1/M10-4/M10-4S XSCF Control Package (XCP) Firmware Image Software Version Matrix Information
<NOTE:1598634.1> - Fujitsu M10-1/M10-4/M10-4S Fan / Fantray temperature and failure behavior

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