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Unable to access FC LUNs via HA-pair after controller replacement

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Applies to

  • ONTAP 9
  • FC
  • Windows Server

Issue

Unable to access FC LUNs via HA-pair after controller replacement

  • Windows Server event log shows:

mpio event 47

An error occurred while the system tried to claim a Multipath I/O (MPIO) path. The location of the failing path is described by the SCSI address (4, 0, 1, 0) (Port, Bus, Target, Lun). To resolve this issue, either reboot the system, or show hidden devices in Device Manager and try uninstalling the specific disk device indicated above, and then rescan for hardware changes.

  • Without MPIO LUNs are visible but as separate devices(multiple disk entries)

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