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How to verify Windows fibre channel configurations with multipathing I/O

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Applies to

  •  Data ONTAP 7 and earlier 
  •  Data ONTAP 8 7-Mode 
  •  DSM for Windows MPIO 
  •  FlexPod

Description

This document discusses how to view the MPIO configuration and status with both forms of the DSM.

  • SANs often provide multiple paths to allow hosts to access LUNs.
  • To maximize the redundancy of the SAN, the host operating system must use multipathing I/O (MPIO) software.
  • MPIO software monitors all the available paths and will decide which path should be used for the operating system.
  • The Microsoft MPIO system is automatically configured using DSM.
  • It uses in-band communication with the storage cluster to determine the primary and secondary paths.

Syslog and EMS messages

[hostname: scsitarget.partnerPath.misconfigured:error]: FCP Partner Path Misconfigured.
[hostname: scsitarget.partnerPath.misconfigured:error]: FCP Partner Path Misconfigured - Host I/O access through a non-primary and non-optimal path was detected.

For a complete discussion of this error message, see the article What do FCP Partner Path Misconfigured messages mean?

Terminology

  • Partner path: Any path to LUNs that utilizes the partner node to access a LUN hosted by the local node. The LUNs are in an active-active cluster.
  • Non-primary path: Synonymous with partner path, proxy path and secondary path. All are examples of a non-primary path.
  • FCP target port: The fibre channel interface that provides FCP service to hosts.
  • Virtual Target Interconnect (VTIC): The virtual FCP target interface seen in the initiator group list. VTIC is used to indicate that the initiator has access to a secondary path.
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