RadiSys ATCA-4616 Dokumentacja Pobierz pdf (Strona 35)

Software Architecture

Shelf Manager cooling override

TheShelfManagerprovidesautonomouscoolingmanagementfortheshelf.However,there

maybesituationsunderwhichasystemmanagermightneedtooverridetheShelfManager's

coolingmanagementandcontrolfanspeedsitself.HPIapplicationscanchangefanspeeds

incrementallyusingstandardHPIcontrolsinthefanresources.FormoredetailsontheHPI

controls,seethecoolingandfancontrolsectionoftheSAFMappingSpecification.

Eachfanresourcehasonefancontrolinitsresourcedatarecord(RDR)repository.Inthe

ATCA‐6000andATCA‐6006shelves,systemmanagersmaychoosetousetheindividualfan

controlstooperateonlycertainfansmanuallywhilelettingtheShelfManageroperatethe

others.ThiscanbeusefulwhenthesystemmanagerwishestooverridetheShelfManager

coolingmanagementonlyononesideoftheshelfthathostsspecifichardware.

Note:IntheATCA‐6014andATCA‐6016shelves,allfansarecontrolledtogether.Makinga

changetoanyofthefancontrolsaffectsallofthefans.

Systemmanagerscanalsochoosetocompletelyoverridethecoolingalgorithmandusean

externalcoolingmoduletocontrolcooling.ThisisdescribedinOverridingthecooling

algorithmonpage 74.Overridingthecoolingalgorithmalsopreventsanyfanspeedchanges

causedbytheadaptivefanflooralgorithm;however,thealgorithmcouldsetanewfanfloor,

whichwouldtakeeffectifcoolingcontrolwerereturnedtotheShelfManager.

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