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Why was no Automatic Unplanned SwitchOver triggered when the whole site was down?

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Category:
metrocluster
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metrocluster
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Applies to

  • Fabric MetroCluster
  • No third-site arbitration

Answer

If there is no third-site arbitration like Tiebreaker, Mediator, or a ProLion Solution and the whole site is down, there is no way for the surviving site to know if the whole site is down and data is not served or just the connectivity ISL/peering is down and the site is up and serving data. If a SwitchOver is triggered in the latter case this will result in a split-brain scenario, which has to be avoided at all costs.

Additional Information

In case of a rolling failure where controllers fail before the storage and respectively the switches and the bridges, then Automatic Unplanned SwitchOver will be triggered. 

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