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METHOD AND ARRANGEMENT FOR OPERATING A COMPUTER CLUSTER

  • US 20120290691A1
  • Filed: 04/18/2012
  • Published: 11/15/2012
  • Est. Priority Date: 05/11/2011
  • Status: Active Grant
First Claim
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1. A method for operating a computer cluster distributed over multiple locations using quorum mechanism, wherein said cluster (C) comprises a plurality of interconnected defined system instances running on one of a physical and a virtual hardware, and wherein a cluster configuration (CC) comprises location information about each system instance defined in said cluster (C), the method comprising:

  • distributing said cluster configuration (CC) to each defined system instance;

    constantly checking connectivity among said system instances defined in said cluster (C) to determine reachable system instances, wherein each healthy system instance determines a subcluster (SCx) comprising itself and all reachable system instances said healthy system instance is connected to, using information of said distributed cluster configuration (CC);

    calculating a corresponding subcluster configuration (SCC(SCx)) comprising location information about each system instance of said subcluster (SCx); and

    using said subcluster configuration (SCC(SCx)) information and said cluster configuration (CC) information for computing a new quorum decision for said corresponding subcluster (SCx) said healthy system instance is member of, using a location quorum function (LQF) considering proportions of connected locations containing reachable system instances, and weights of said reachable system instances in said locations,wherein workload placement decisions are made based on a computed new quorum granting permission to place workload to system instances in a specific subcluster (SCx), or refusing said permission, whenever said subcluster (SCx) changes.

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