Dynamic quorum adjustment
AssigneeInternational Business Machines Corporation
InventorsEugene Johnson, Radha R. Kandadai, Frank J. Mangione
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Abstract
In a multinode data processing system capable of partitioning operations a method is provided for adding nodes to a configuration of nodes in a manner which node quorums are employed but in which two quorum values (ideal and enforced) are employed and in which old nodes using a given file system are distinguished from new nodes. The method prevents even the transient use of inappropriate quorum values.
Claims3
A method for dynamically adding nodes to a network subject to partitioning for which there is also a requirement that a quorum of nodes be present for file system operation, said method comprising the steps of:
- establishing, for a current configuration of nodes, a first quorum value based on the number of nodes in the current configuration;
- initiating addition of proposed nodes to the configuration and establishing a second quorum value based on the existing number of nodes and the number of nodes to be added;
- and
- completing addition of at least one proposed node, to the configuration of nodes, based on said second quorum value and also upon a designation that said proposed node was part of said current configuration and updating said first quorum value to reflect the completed addition.
Dependencies are inferred from the claim text.