Specifications

2
Software Architecture
34
IfbothSCMsareremovedfromtheATCA‐6014orATCA‐6016shelf,theactiveRCMadjuststhe
fanstofullspeeduntiltheShelfManagerresumesmanagingtheshelf.
Whenafanmoduleisdeactivated(bytog glingitshot‐swapswitchorperformingthesoftware
hot‐swapprocedurethroughthe
CLI),themotorwi llbeturnedoff.Afanwhoseswitchisin
thewrongpositionatshelfpowerupwillimmediatelybepoweredoffassoonastheShelf
Managerinitializes.
Adaptive fan floor algorithm
Anadaptivefanflooralgorithmattemptstodetermineafanfloorlevelthatminimizesboth
fannoiseandchangestofanspeedswhilestillachievingtheneededcooling.TheShelf
Managerwillnotlowerthefanspeedbelowthisfloor.
TheShelf Managerhasadefaultsettingof30percentfor
thefanfloor,anduserscanmanually
setahigherfanfloorasdescribedinSettingtheminimumfanspeedonpage 45.Thefanfloor
algorithmmaydetermineanewfanfloorvalueabovethedefaultoruser‐specifiedfloor,
whichcouldbeuptothemaximumfloorof80
percent.
Thefanflooralgorithmrunsevery30minutesandtakesintoaccountanytemperature
sensorsthathavegeneratedthreshold‐crossingeventsaswellasthenumberoffanlevel
increasesanddecreasesduringthattime.Thealgorithmislikelytoincreasethelevelofthe
fanfloorifthefanspeedhasincreasedanddecreasedseveraltimesduringthe30‐minute
window.Itwilldecreasethefanfloortoreducethenoiseifnotemperaturealar mswere
generatedandifthefloorisnotalreadysettotheminimum.
ThecurrentfanfloorsettingcanbereadfromtheShelfFanFloorLevelsensor,whichis
describedinTable 20onpage 146.Inaddition,theresultsofeachrunofthefanfloor
algorithmandthecorrespondingfanfloorsettingareshownintheShelfManagerlogfiles
(/tmp/shmgr/shmgr.log*.tgz).Tofindthefanfloorinformation,searchthelogfileforthis
string:
SHMS<Cooling>
Thesensorandlogfilereportthefanfloorlevelasapercentageofthemaximumfanspeed.