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Software Architecture

Inenhancedmode,theShelfManagerusesthe/etc/shmgr.conffile.TheShelfManagerdoes

notneedtousetheshmgr_basic.conffileprovidedforbasicmode;itcandiscoverand

manageanytypeofATCAnodemodule.Thersys‐ipmitoolutilityisalsoavailablefor

performingoperationsatthecommandshell

andinscripts.

Software redundancy

ThefollowingsectionsapplyonlytoshelveswhereanSCMisactingastheShelfManager.

TheydonotapplytoATCA‐6002shelves.

Shelf Manager redundancy

TheShelfManageroperatesinafullyredundantactive‐standbymodelwhenbothSCMsare

installed.Duringsystemstartup,ifredundantShelfManagersaredetected,anarbitration

mechanismbetweenthepeerShMCsdecideswhichonetakesoverasactivewhiletheother

assumesthestandbyrole.OncearbitrationiscompleteandtheactiveShelfManageris

initialized,theActiveLEDontheactiveShelfManagerglowssolidamber.TheactiveShelf

Managerisresponsibleformonitoringandmanagingtheshelf.Allconfigurationchangesand

eventdataaresynchronizedwiththestandbyShelfManagersothatitisreadytoassumethe

activeroleatanypointoftime.

OnasingleSCM,theShMSrunningontheLMPandtheShMCcommunicatewitheachother

overaseriallinkusingtheOpenIPMIserialdriverinBasicmode.ThetwoShMCsfromthe

SCMpaircommunicateovertheIPMB,whichisphysicallyredundant.Additionally,thetwo

ShMSsfromtheSCMpairsynchronizeoveranEthernetLANinterfaceonthebackplane.

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RadiSys ATCA-4616 Specifiche Pagina 25