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The most vital concept needed for a cluster to function is that of a quorum A quorum guarantees consistency of the services offered by the cluster by ensuring that speci c services and applications are offered only by a single active node, and that services and applications are offered only if the resources needed are available The quorum con guration tells the cluster the number of failures it can handle before effectively going of ine At a high level, this is achieved by ensuring the majority of the cluster is available to stay active for example, in a three-node cluster, at least two nodes must be available However, in practice, you have more granular control over what constitutes the majority of the cluster In Windows Server 2003, there were two basic quorum models that de ned how the quorum was achieved and used The most used model was the Single Quorum Device cluster, which consisted of a number of nodes connected to some kind of shared storage (SAN commonly), with a volume speci ed as the quorum disk that helped the cluster con guration database As long as the quorum was available with at least one node, the cluster was available, no matter how many nodes in total there were The problem with this model was if the cluster quorum disk was unavailable, the entire cluster became unavailable; even though SANs are highly available with RAID to protect volumes, there were problems in production, and the loss of the quorum disk was a major threat and a single point of failure The other model supported in Windows Server 2003 was the
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Majority Node Set Cluster, which did not use a shared quorum disk, but instead each node in the cluster held its own copy of the cluster database To maintain the quorum, over half the nodes had to be available, which meant you had to have a minimum of three nodes in the cluster, which was not commonly the case in most production environments, a cluster consisted of two nodes An update for Windows 2003 SP1 also introduced the concept of a le share witness that could be used in place of the shared quorum disk and could have a vote in the cluster; this meant a two-node cluster could stay active as long as either both nodes were running or one node and the le share witness, which is carried on into the 2008 Windows Server 2008 combines the two main Windows Server 2003 models and gives certain elements of a cluster a vote To maintain the quorum, the majority of the votes have to be present Cluster components that could have a vote are the following:
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Cluster nodes A shared disk containing a copy of the cluster con guration Registry, which, instead of being called the quorum disk, is renamed to the witness disk Only one witness disk per cluster A le share that does not contain a copy of the cluster con guration Registry but can hold a vote Only one le share witness per cluster
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You cannot have both a le share witness and a witness disk in a cluster One new feature of Windows Server 2008 is that the witness disk no longer has to have a drive letter assigned, or even a mount point, for that matter Windows Server 2008 has one quorum model, the Majority Quorum Model, which allows the removal of dependence on any one aspect of the cluster It requires the majority of the votes in the cluster to be present There are four different quorum mode con gurations available with Windows Server 2008 Some take advantage of the new majority quorum model capabilities, and others emulate the Windows Server 2003 options in the way votes are allocated
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