RadiSys ATCA-4616 Dokumentacja Pobierz pdf (Strona 34)

Software Architecture

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.

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RadiSys ATCA-4616 Dokumentacja Strona 34