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Cisco Bug: CSCub16946 - C24-LSI Chip temperature too high when system is idle.

Last Modified

Mar 02, 2018

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

1.4(5.45)

Description (partial)

Symptom:

PCIe cards installed in UCS C22 M3 and UCS C24 M3 systems may overheat when the system is idle. The issue has been observed only with LSI 9266 RAID Controllers installed in UCS C22 M3 and UCS C24 M3 chassis. This issue is caused by a cooling fan algorithm which reduces fan speed below the minimum required when the system is idle.

The following symptoms have been observed:

1. The server may hang after several hours without any activity or during a reboot. 

2. The /var/log/messages directory will have multiple entries similar to the following: 

kernel: scsi: killing requests for dead queue kernel: scsi: killing requests for dead queue 

3. When running the MegaCLI command with the parameters noted below, output of it will have high chip temperatures as in this example: 
./MegaCli64 -FwTermLog -Dsply -a0 | tail 
07/18/12 20:51:41: Max Temp is 151 Deg C on Channel 2l 4 is 150 
07/18/12 20:51:41: Measured chip temperature at Channel 0 is 146 
07/18/12 20:51:41: Measured chip temperature at Channel 1 is 149 
07/18/12 20:51:41: Measured chip temperature at Channel 2 is 151 
07/18/12 20:51:41: Measured chip temperature at Channel 3 is 146 
07/18/12 20:51:41: Measured chip temperature at Channel 4 is 151 
07/18/12 20:51:46: Max Temp is 151 Deg C on Channel 2 

Conditions:

Symptoms noted for the issue have been observed only with the combination of UCS C22 M3 or UCS C24 M3 chassis and LSI 9266 RAID Controller
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