System Event Log Troubleshooting Guide for EPSD
Platforms Based on Intel
®
Xeon
®
Processor E5 4600/2600/2400/1600/1400 Product Families
Cooling Subsystem
Revision 1.1 Intel order number G90620-002 45
5. Cooling Subsystem
5.1 Fan Sensors
There are three types of fan sensors that can be present on Intel
®
Server Systems: speed, presence, and redundancy. The last two
are only present in the systems with hot-swap redundant fans.
5.1.1 Fan Tachometer Sensors
Fan tachometer sensors monitor the rpm signal on the relevant fan headers on the platform. Fan speed sensors are threshold-based
sensors. Usually they only have lower (critical) thresholds set, so that a SEL entry is only generated if the fan spins too slowly.
Table 29: Fan Tachometer Sensors Typical Characteristics
30h-3Fh (Chassis specific)
BAh-BFh (Chassis specific)
Event Direction and
Event Type
[7] Event direction
0b = Assertion Event
1b = Deassertion Event
[6:0] Event Type = 01h (Threshold)
[7:6] – 01b = Trigger reading in Event Data 2
[5:4] – 01b = Trigger threshold in Event Data 3
[3:0] – Event Trigger Offset as described in Table 30
Reading that triggered event
Threshold value that triggered event
The following table describes the severity of each of the event triggers for both assertion and deassertion.
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