MPIO_DSM_Path_V2 - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// mpiodisk.h

typedef struct _MPIO_DSM_Path_V2 {
  ULONGLONG DsmPathId;
  ULONGLONG Reserved;
  ULONG     PathWeight;
  ULONG     PrimaryPath;
  ULONG     OptimizedPath;
  ULONG     PreferredPath;
  ULONG     FailedPath;
  ULONG     TargetPortGroup_State;
  ULONG     ALUASupport;
  UCHAR     SymmetricLUA;
  UCHAR     TargetPortGroup_Preferred;
  USHORT    TargetPortGroup_Identifier;
  ULONG     TargetPort_Identifier;
  ULONG     Reserved32;
  ULONGLONG Reserved64;
} MPIO_DSM_Path_V2, *PMPIO_DSM_Path_V2;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ns-mpiodisk-_mpio_dsm_path_v2)

_MPIO_DSM_Path_V2 structure

Description

The MPIO_DSM_Path_V2 structure is used to represent the DSM's definition of a path. It is a superset of the previously existing MPIO_DSM_Path class.

Members

DsmPathId

An unsigned 64-bitfield that is used as a unique identifier to distinguish paths known to the DSM.

Reserved

Should be zero.

PathWeight

An unsigned 32-bitfield that holds the weight associated with the given path.

PrimaryPath

An unsigned 32-bitfield that is used as a flag to indicate the path state when accessing a particular LUN.

OptimizedPath

An unsigned 32-bitfield that is used in conjunction with PrimaryPath to indicate the path state for accessing a LUN.

PreferredPath

An unsigned 32-bitfield that is used as a flag to indicate whether this is the preferred path for accessing the LUN.

FailedPath

A 32-bit unsigned field that is used as a flag to indicate if the path has failed.

TargetPortGroup_State

An unsigned 32-bitfield that is used to indicate the access state of the target port group to which this instance of the LUN belongs.

ALUASupport

An unsigned 32-bitfield that returns the Asymmetrical Logical Unit Access (ALUA) state transition support that is indicated by the LUN.

SymmetricLUA

An unsigned 8-bitfield that is used as a flag to indicate to the application if logical unit access is symmetric.

TargetPortGroup_Preferred

An unsigned 8-bitfield that is used as a flag. This field indicates if the LUN's target port group that corresponds to this path is preferred for the LUN access.

TargetPortGroup_Identifier

An unsigned 16-bitfield that contains the identifier of the LUN's target port group that corresponds to this path.

TargetPort_Identifier

An unsigned 32-bitfield that contains the identifier of the target port that corresponds to this path through which the LUN has been exposed.

Reserved32

Should be zero.

Reserved64

Should be zero.

View the official Windows Driver Kit DDI reference

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