Question

Commvault LiveSync split brain over network failure?

  • 7 June 2023
  • 1 reply
  • 72 views

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What are the implications of running LiveSync across 2 sites each with a CommServe and automatic failover set to occur? In the case of a Primary CommServe failure I see no issue and expect the monitoring nodes (both sites) to trigger transfer of the primary function to the CommServe at the other site.

However… What if site A becomes isolated from site B with a network failure between both sites? I expect the Primary Commserve continue to run its site but will the CommServe in site B become active at site B as well with the monitoring nodes there losing connection with the CommsServe at site A? 

Will this result in a “Split Brain” condition across both sites??? If so, what happens on network reconnection??? 


1 reply

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All monitoring nodes must report the active CS as down or lost connectivity. We ask that you place one monitoring node in the same network as your CS (both production and standby) to check mates this type of split brain.

And once automatic failover is triggered, even if the old active node comes back online, it will be brought down automatically and marked passive.

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