Method and system for consistent cluster operational data in a server cluster using a quorum of replicas
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United States of America Patent
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Jun 4, 2002
Grant Date -
N/A
app pub date -
Mar 26, 1999
filing date -
Mar 26, 1999
priority date (Note) -
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Abstract
A method and system for increasing the availability of a server cluster while reducing its cost by requiring at a minimum only one node and a quorum replica set of storage devices (replica members) to form and continue operating as a cluster. A plurality of replica members maintain the cluster operational data and are independent from any given node. A cluster may be formed and continue to operate as long as one server node possesses a quorum (majority) of the replica members. This ensures that a new or surviving cluster has a least one replica member that belonged to the immediately prior cluster and is thus correct with respect to the cluster operational data. Update sequence numbers and/or timestamps are used to determine the most updated replica member from among those in the quorum for reconciling the other replica members.
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