HP Serviceguard manual No Arbitration-Risks

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Arbitration for Data Integrity in Serviceguard Clusters

To Arbitrate or Not to Arbitrate

No Arbitration—Risks

When all is said and done, it may be very unlikely that intra-node communication would be lost in the above configurations, but it is still possible that heartbeat could disappear, with both nodes still running, and this scenario can cause data corruption.

The risk of split brain syndrome is considerably greater with extended distance clusters and disaster tolerant solutions in which nodes are located in different data centers at some distance from each other. For these types of solution, some form of arbitration is essential.

The unlikely but possible scenario of split brain can be definitively avoided with an arbitration device. In other words, the risk of data corruption can be eliminated. The HP Serviceguard family of clustering software includes this level of protection.

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Contents Manufacturing Part Number B3936-90078 July Arbitration For Data Integrity Serviceguard ClustersLegal Notices Arbitration for Data Integrity in Serviceguard Clusters Membership Cluster Membership ConceptsCluster Membership Concepts Split-Brain QuorumTie-Breaking Multiple Heartbeat Failures To Arbitrate or Not to ArbitrateNo Arbitration-Multiple Paths Single Node Failure No Arbitration-Multiple MediaAdditional Multiple Paths with Different Media Multiple Paths with Different MediaNo Arbitration-Risks Startup and Re-Formation How Serviceguard Uses ArbitrationCluster Startup Cluster Lock Dynamic Cluster Re-FormationCluster Quorum and Cluster Locking No Cluster Lock Lock Requirements Lock Disk Operation Use of a Lock Disk as the Cluster LockDual Cluster Lock Single Cluster LockUse of a Lock LUN as the Cluster Lock Lock LUN Operation Oot IrrorQuorum Server Operation Use of a Quorum Server as the Cluster LockRunning the Quorum Server Setting up the Quorum ServerQuorum Server Status and State Specifying a Quorum ServerViewing Quorum Server System Data Viewing Quorum Server Status and StateUse of Arbitrator Node Use of Arbitrator NodesMetropolitan Clusters Arbitration in Disaster-Tolerant ClustersExtended Distance Clusters Quorum Server Arbitrator NodesUse of Dual Lock Disks in Extended Distance Clusters Continental ClustersDisk area is not mirrored Arbitration for Data Integrity in Serviceguard Clusters Comparison of Different Arbitration Methods Arbitration Advantages Disadvantages ModeSummary Arbitration for Data Integrity in Serviceguard Clusters Summary

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