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CONTAP-660817: Filesystem lost quorum when partner node fails to takeover

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ontap-9
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core
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Issue

Experienced data unavailability in two-node ONTAP clusters where nodes failed to takeover due to the timing of the failure:

  • The HA interconnect (HAIC) times out and disables takeover (15-17 seconds)
  • The mediator mailbox updates continue working during this timeout period
  • Since nodes can still see partner heartbeat updates, no takeover occurs
  • When network isolation completes, the surviving node loses quorum and shuts down data services to protect data integrity

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