MajorityNodeSetsupportinMicrosoftWindows Server 2003clustersSteveMathiasPremierServicesMicrosoftCorporation1ObjectivesThispresentationwilldiscussanewfeatureofMicrosoft®WindowsServer™2003clustersnamedMajorityNodeSet(MNS).Thispresentationassumesabasicknowledgeofserverclustering(MSCS).2AgendaWhatisMNS?MNSisdesignedforahandfulofkeyscenarios:ClustersthathavegeographicallydispersedclusternodesClustersthatdonotrequirea“shareddisk”Purposeofaquorumresource:ArbitrationStorage3Agenda(continued)DefinehowMNSbehavesasaquorumresourceSampledeploymentofaMNSserverclusterDefinewhereMNSisconfiguredWhattoconsiderwhenusingMNSBasictroubleshootingoftheMNSresource4MNSWhatisMNS?MNSisanewquorum-Scenario:“mirroring”:Scenario::Applicationscanfailoverandhaveconfigurationinformationstoredonthecluster,,-PurposeofaquorumresourceGenerallyspeaking,aquorumresourcemustprovidetwokeyfunctions:Arbitration,,Purposeofaquorumresource:arbitrationArbitrationofthequorumresourceishowtheclusterserviceprevents“split-brain.”Inasplit-municationfailurescauseaclustertobreakintodisjointpartitionsofnodes,andeachpartitionwantstoindividuallyactasthecluster. Exampleofsplit-brain:Bothnodesinatwo-nodeclusterbr
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