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Thursday, October 15, 2015

What are Tie-breakers in Red Hat Cluster?

Tie-breakers are additional heuristics that allow a cluster partition to decide whether or not it is quorate in the event of an even-split - prior to fencing.
  • With such a tie-breaker, nodes not only monitor each other, but also an upstream router that is on the same path as cluster communications.
  • If the two nodes lose contact with each other, the one that wins is the one that can still ping the upstream router.
  • That is why, even when using tie-breakers, it is important to ensure that fencing is configured correctly.CMAN has no internal tie-breakers for various reasons. However, tie-breakers can be implemented using the API

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