HP ProLiant DL170e HP ProLiant DL170e G6 Server Maintenance and Service Guide - Page 68

Fan fault handling

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Fan fault handling Fan fault signals will drive the lighting of an LED for each failed fan. Each node will log fan faults for its associated fan pair only. A failed fan is considered Critical and will cause the two associated nodes to perform a graceful shutdown (driven by the BMC). The surviving fan in the pair will go to certain PWM defined by thermal (automatically initiated by the microcontroller of fan) in order to maintain airflow across the HDD's. This PWM will be different than the minimum PWM set by the microcontroller in healthy fan case when one side of nodes is powered off. In other words, the microcontroller will have two different minimum PWM, one for fan fail case, and one for healthy fan case. The microcontroller will also mask fan faults for the fans not present in front of the node. The microcontroller will mask (not report) any fan faults during the 45 second period after any node is powered ON. This is required to allow various fans to settle and reach their normal operating speed. Nodes will often drive a short period of fan speeds set to blowout during POST, and these have been known to cause the reporting of spurious fan faults. Removal and replacement procedures 68

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Removal and replacement procedures
68
Fan fault handling
Fan fault signals will drive the lighting of an LED for each failed fan. Each node will log fan faults for
its associated fan pair only. A failed fan is considered Critical and will cause the two associated
nodes to perform a graceful shutdown (driven by the BMC). The surviving fan in the pair will go to
certain PWM defined by thermal (automatically initiated by the microcontroller of fan) in order to
maintain airflow across the HDD’s. This PWM will be different than the minimum PWM set by the
microcontroller in healthy fan case when one side of nodes is powered off. In other words, the
microcontroller will have two different minimum PWM, one for fan fail case, and one for healthy fan
case. The microcontroller will also mask fan faults for the fans not present in front of the node. The
microcontroller will mask (not report) any fan faults during the 45 second period after any node is
powered ON. This is required to allow various fans to settle and reach their normal operating speed.
Nodes will often drive a short period of fan speeds set to blowout during POST, and these have been
known to cause the reporting of spurious fan faults.