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E-Series Volume Keeps Going Offline: iSCSI Carrier Lost on Controller Ports

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Applies to

  • NetApp E-Series E2824
  • SANtricity OS version 11.90R2
  • Direct-attached vSphere ESXi hosts
  • iSCSI environments

Issue

Production volume (~perf01) intermittently goes offline, causing all ESXi hosts to lose access to data. The following log and symptom details were observed:

  • Log output:
    • “port on both controller A and B are reporting ISCSI carrier lost. Then it is discovered and restarted. But the process repeats over and over.”
    • “Port statistics show receiving errors but no transmitted errors.”
    • “Volume fails over between controllers due to IO shipping triggered by host inability to communicate with the preferred path.”

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