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Software Architecture

•UsingthefrontpanelresetbuttontoresettheactiveSCMeithermanuallyorusingHPI

withthesaHPIResourceResetStateSet()function.

WhentheSCMisactingastheactiveShelfManager,itsActiveLEDglowsamber.Onthe

standbyShelfManager,thisLEDflashesperiodically,aboutonceevery2seconds.Duringa



switchoveroperationinwhichtherolesoftheShelfManagersareswapped,theLEDflashes

rapidlyonthe ShelfManagerthatismovingfromstandbymodetoactivemodeuntilthe

switchoveriscomplete.ArapidlyflashingamberLEDindicatesthattheShelfManageris

preparingitshighavailabilityrole.AfterashelfpoweruporanSCMreboot,youmightseethe

amberLEDflashingrapidlybeforeitbecomessteadyinactivemodeorslowlyblinkingin

standbymode.

Shelf Manager redundancy sensor

TheHPIShelfManagerresourcecontainsastandardsensorthatmonitorstheShelf

Manager’sredundancystatus.TheShelfManagerredundancysensorisadiscretesensorthat

indicatesiftheShelfManagerisredundantatanypointoftime.Fordescriptions,seethe

virtualShelfManagerresourceRPTentrysectionoftheSAFMappingSpecification.

TheShelfManagersareconsideredredundantwhenthefollowingconditionsaremet:

1. TheactiveShelfManagerhasestablishedthepresenceofthestandbyShelfManager

usingadedicatedIPMIoveraLANsessionoverthesynchronizationchannel.

2. ThestandbyHPIserverhassuccessfullycompletedtheinitialrefreshsyncwiththeactive

HPIserver.

3. TheactiveandstandbyShelfManagershaveestablishedthattheyarerunningthesame

softwareversion.

Whenalloftheaboveconditionsaremet,theShelfManagerredundancysensorreportsthe

eventstateSAHPI_ES_FULLY_REDUNDANT,signifyingfullredundancyhasbeenachieved.

Ifthefirsttwoconditionsare

notmet,theShelfManagerredundancysensorreportsthe

eventstateSAHPI_ES_REDUNDANCY_LOST_SUFFICIENT_RESOURCES,signifyingthatthe

ShelfManagersarecurrentlynotredundant,buttheactiveShelfManagerisstillcapableof

managingtheshelf.Associatedalarmsarecreat edwhenredundancyislostbetweentheShelf

Managers.

Ifthethirdconditionisnotmet,theShelfManagerredundancysensorreportstheeventstate

SAHPI_ES_REDUNDANCY_DEGRADED,signifyingthattheShelfManagerisstillfully

functional,butthatanynewfeaturesavailablewiththelatersoftwareversionaredisabled.

Thisconditionisnotconsideredanalarmandnoalarmislogged;however,aneventis

generated.

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RadiSys ATCA-4616 Spezifikationen Seite 28