Input/Output Hub over temp errors

Troubleshooting

Problem

Users may experience Input/Output Hub (IOH) over temp issues when running Integrated Management Module (IMM) code below 91K. IPMI:(03/22/2011 20:47:55) Processor or I/O module 1 (Temperature - IOH Temp Status): Assertion: Transition to Critical from less severe. When two (2) processors are installed, users may see the above IPMI events.

Resolving The Problem

Source

RETAIN tip: H203118

Symptom

Users may experience Input/Output Hub (IOH) over temp issues when running Integrated Management Module (IMM) code below 91K.

	IPMI:(03/22/2011 20:47:55) Processor or I/O module 1 (Temperature - IOH Temp Status): Assertion: Transition to Critical from less severe.

When two (2) processors are installed, users may see the above IPMI events.

Affected configurations

The system may be any of the following IBM servers:

System x3550 M2, type 4198, any model
System x3550 M2, type 7946, any model
System x3550 M3, type 4254, any model
System x3550 M3, type 7944, any model
System x3650 M2, type 4199, any model
System x3650 M2, type 7947, any model
System x3650 M3, type 4255, any model
System x3650 M3, type 7945, any model

This tip is not software specific.

This tip is not option specific.

The system is configured with two (2) CPU's.

The versions previous to 91K firmware for the IMM is affected.

Solution

This behavior is corrected in IMM code level 91K.

The file is or will be available by selecting the appropriate Product name, Product machine type, and Operating system on IBM Support's Fix Central web page, at the following URL:

http://www.ibm.com/support/fixcentral/systemx/groupView?query.productGroup=IBM%2FSystemx

Additional information

This is due to fan speed calculation. The IMM 91K addresses this by changing the temp/altitude algorithm of fan speed to compensate for the second processor.

Document Location

Worldwide

Operating System

System x:Operating system independent / None

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Tips

Input/Output Hub over temp errors - IBM System x