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Microsoft SQL Server 2008 High Availability by Hemantgiri S. Goswami

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The Quorum

Dictionary says that a Quorum is the minimum number that should match to perform a task further or to make a decision. Here, in the case of clustering, the meaning is no different.

As we all know by now, the cluster nodes send and receive information over the network. It is very possible that sometimes a change is done at the node that is the owner or active node, which then fails before sending the data back to another node in the cluster; in this case the cluster will not work. The nodes in clusters vote and based on that it will be decided whether or not the node should continue; for example, there is a four-node cluster and three of them can talk to each other but not the node3.

Quorum is a resource where all events pertaining to ...

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