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Cisco Bug: CSCuq70724 - DIMM I2C controller should reset when controller gets stuck

Last Modified

Sep 17, 2019

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

2.1(1a)B 2.1(2a)B 2.1(3a)B 2.2(1a)B 2.2(2c)BS26

Description (partial) 

Symptom:
The chassis FAN speeds will spin at 100% because the chassis/IOM cannot obtain DIMM temperature readings from a blade. When in this state, the blade can no longer obtain DIMM temperature sensors.

Conditions:
An invalid I2C transaction occurred on the DIMM I2C bus. These transactions often come from software running on the x86 host.
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