My fans cycle up and down


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Unraid build with most current version.

Norco 4U rack mount 24 drive enclosure.

Noctua (NF-P12 PWN) fans and (NF-R8 PWM).

SuperMicro MBD-X9SCM-F-O LGA 1155 Intel Micro ATX Intel Xeon E3 Server Motherboard.

Intel E3-1230V2 LGA1155 Processor

120mm fan wall bracket

 

My fans, when server is idle for awhile, start cycling up and down in about a 15 second period.  Fans ramp up and then immediately ramp down.  Can this be stopped?  Sometimes with a shutdown and power up it stops until I access the server again.  I am in Texas where it's warmer than most places, but i'ts in a well ventilated space.

 

Thoughts?  

 

Everything else about it works well.  It's just a bit annoying.

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