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Linux Host Recommendations for NVMe/FC protocol support with NetApp MetroCluster IP

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Applies to

  • NetApp Interop Matrix Tool supported Linux OSs – RHEL, SLES, & Oracle Linux.
  • NetApp MetroCluster Solution with NVMe/FC protocol support.
  • Negotiated and Unplanned MetroCluster (With Mediator or Tie-Breaker) Site SwitchOver workflows.
  • ONTAP 9.12.1 GA and later.

Issue

  • During ONTAP MetroCluster IP SwitchOver, an All Paths Down (APD) window is encountered, during which the Primary Cluster site switches over to its Secondary/Peer Cluster site.
  • During this APD window, the host/client loses access to all NVMe namespace devices since all paths are down.
  • If this APD window exceeds a specified interval, the Linux NVMe/FC host gives up resulting in an I/O error to the overlying applications.

 

 

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