MPIO_DEVINSTANCE_HEALTH_CLASS - NtDoc

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

typedef struct _MPIO_DEVINSTANCE_HEALTH_CLASS {
  ULONGLONG PathId;
  ULONGLONG NumberReads;
  ULONGLONG NumberWrites;
  ULONGLONG NumberBytesRead;
  ULONGLONG NumberBytesWritten;
  ULONGLONG NumberRetries;
  ULONGLONG NumberIoErrors;
  ULONGLONG CreateTime;
  ULONGLONG FailTime;
  BOOLEAN   DeviceOffline;
  UCHAR     NumberReadsWrap;
  UCHAR     NumberWritesWrap;
  UCHAR     NumberBytesReadWrap;
  UCHAR     NumberBytesWrittenWrap;
  UCHAR     Pad[3];
} MPIO_DEVINSTANCE_HEALTH_CLASS, *PMPIO_DEVINSTANCE_HEALTH_CLASS;
View the official Windows Driver Kit DDI reference

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

_MPIO_DEVINSTANCE_HEALTH_CLASS structure

Description

The MPIO_DEVINSTANCE_HEALTH_CLASS structure holds the health information for an instance of a device exposed through the specified path identifiers.

Members

PathId

An unsigned 64-bitfield that returns the path identifier that is associated with this instance of a multi-path disk.

NumberReads

An unsigned 64-bitfield that specifies the number of read requests that are serviced by the specified path identifier.

NumberWrites

An unsigned 64-bitfield that specifies the number of write requests that are serviced by the specified path identifier

NumberBytesRead

An unsigned 64-bitfield that specifies the total number of bytes that are read through the specified path identifier

NumberBytesWritten

An unsigned 64-bitfield that specifies the total number of bytes that are written through the specified path identifier.

NumberRetries

An unsigned 64-bitfield that specifies the total number of retries through the specified path identifier.

NumberIoErrors

An unsigned 64-bitfield that specifies the total number of I/O errors that are encountered through the specified path identifier.

CreateTime

A 64-bit integer that specifies the system time when this instance was created and exposed.

FailTime

A 64-bit integer that specifies the system time when the path associated with this path ID was removed.

DeviceOffline

A Boolean field that indicates whether the path associated with this path ID has been removed.

NumberReadsWrap

An unsigned character field that specifies the total number of times the NumberReads parameter has rolled around to zero.

NumberWritesWrap

An unsigned character field that specifies the total number of times the NumberWrites parameter has rolled around to zero.

NumberBytesReadWrap

An unsigned character field that specifies the total number of times the NumberBytesRead parameter has rolled around to zero.

NumberBytesWrittenWrap

An unsigned character field that specifies the total number of times the NumberBytesWritten parameter has rolled around to zero.

Pad

Should be zero.

View the official Windows Driver Kit DDI reference

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