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Windows 2008 lun access lost with, error "Microsoft DSM returned a bogus Path to MPIO device identifier"

Last Updated:

Applies to

  • Windows Server 2008 SP2
  • Windows Server 2008 R2 
  • Microsoft Multipath I/O (MPIO) and Microsoft Device Specific Module (DSM)


  • Windows 2008 SP2 or R2-based Server connected to NetApp SAN using Microsoft Multipath I/O (MPIO) and Microsoft Device Specific Module (MS-DSM).
  • In this scenario, when multiple paths are lost concurrently, host loses access to the storage (LUN). 
  • a "System Event ID 33" error message, indicating "Microsoft DSM returned a bogus Path to <MPIO device identifier>", is encountered.


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