MPIO_DSM_Path - NtDoc

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

typedef struct _MPIO_DSM_Path {
  ULONGLONG DsmPathId;
  ULONGLONG Reserved;
  ULONG     PathWeight;
  ULONG     PrimaryPath;
} MPIO_DSM_Path, *PMPIO_DSM_Path;
View the official Windows Driver Kit DDI reference

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

_MPIO_DSM_Path structure

Description

The MPIO_DSM_Path structure is used to represent the DSM's definition of a path.

Members

DsmPathId

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

Reserved

Should be zero.

PathWeight

An unsigned 32-bitfield that holds the weight associated with the given path. The assigned value determines the order in which the DSM will pick the paths if the load balance policy is set to Weighted Path. This means that a user can assign weights to each path that is available for a device and if the Load Balance Policy for the device is set as "Weighted Path," MPIO uses this PathWeight value to determine which path to use.

PrimaryPath

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

View the official Windows Driver Kit DDI reference

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