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Win32_PerfRawData_PerfDisk_LogicalDisk class

The Win32_PerfRawData_PerfDisk_LogicalDisk raw performance data class provides raw data from performance counters that monitor logical partitions of a hard or fixed disk drive. System Monitor identifies logical disk instances by their drive letter, such as C.

This class represents the Logical Disk object in System Monitor. The WMI source of its data is the high-performance Performance Counter Provider. The original data source is the PerfDisk performance library. The corresponding formatted data class is Win32_PerfFormattedData_PerfDisk_LogicalDisk. Data is dynamically provided for this class from the performance library object by the WmiPerfInst provider.

Windows Server 2003, Windows XP, and Windows 2000: WMI data for this class is supplied by the Performance Counter Provider.

The following syntax is simplified from MOF code and shows all inherited properties, including the Frequency and Timestamp properties required for class display in System Monitor. For more information about required property qualifiers, see Property Qualifiers for Performance Counter Classes. For more information about CounterType values, see WMI Performance Counter Types.

Syntax

class Win32_PerfRawData_PerfDisk_LogicalDisk : Win32_PerfRawData
{
  uint64 AvgDiskBytesPerRead;
  uint32 AvgDiskBytesPerRead_Base;
  uint64 AvgDiskBytesPerTransfer;
  uint32 AvgDiskBytesPerTransfer_Base;
  uint64 AvgDiskBytesPerWrite;
  uint32 AvgDiskBytesPerWrite_Base;
  uint64 AvgDiskQueueLength;
  uint64 AvgDiskReadQueueLength;
  uint32 AvgDiskSecPerRead;
  uint32 AvgDiskSecPerRead_Base;
  uint32 AvgDiskSecPerTransfer;
  uint32 AvgDiskSecPerTransfer_Base;
  uint32 AvgDiskSecPerWrite;
  uint32 AvgDiskSecPerWrite_Base;
  uint64 AvgDiskWriteQueueLength;
  string Caption;
  uint32 CurrentDiskQueueLength;
  string Description;
  uint64 DiskBytesPerSec;
  uint64 DiskReadBytesPerSec;
  uint32 DiskReadsPerSec;
  uint32 DiskTransfersPerSec;
  uint64 DiskWriteBytesPerSec;
  uint32 DiskWritesPerSec;
  uint32 FreeMegabytes;
  uint64 Frequency_Object;
  uint64 Frequency_PerfTime;
  uint64 Frequency_Sys100NS;
  string Name;
  uint64 PercentDiskReadTime;
  uint64 PercentDiskReadTime_Base;
  uint64 PercentDiskTime;
  uint64 PercentDiskTime_Base;
  uint64 PercentDiskWriteTime;
  uint64 PercentDiskWriteTime_Base;
  uint32 PercentFreeSpace;
  uint32 PercentFreeSpace_Base;
  uint64 PercentIdleTime;
  uint64 PercentIdleTime_Base;
  uint32 SplitIOPerSec;
  uint64 Timestamp_Object;
  uint64 Timestamp_PerfTime;
  uint64 Timestamp_Sys100NS;
};

Members

The Win32_PerfRawData_PerfDisk_LogicalDisk class has these types of members:

Properties

Properties

The Win32_PerfRawData_PerfDisk_LogicalDisk class has these properties.

AvgDiskBytesPerRead

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (1073874176) , DefaultScale (-2) , PerfDetail (300)

Average number of bytes transferred from the disk during read operations.

For more information about using uint64 values in scripts, see Scripting in WMI.

AvgDiskBytesPerRead_Base

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (1073939458) , DefaultScale (0) , PerfDetail (300)

Base value for AvgDiskBytesPerRead. This value represents the accumulated number of operations that have taken place.

AvgDiskBytesPerTransfer

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (1073874176) , DefaultScale (-2) , PerfDetail (300)

Average number of bytes transferred to or from the disk during write or read operations.

For more information about using uint64 values in scripts, see Scripting in WMI.

AvgDiskBytesPerTransfer_Base

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (1073939458) , DefaultScale (0) , PerfDetail (300)

Base value for AvgDiskBytesPerTransfer. This value represents the accumulated number of operations that have taken place.

AvgDiskBytesPerWrite

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (1073874176) , DefaultScale (-2) , PerfDetail (300)

Average number of bytes transferred to the disk during write operations.

For more information about using uint64 values in scripts, see Scripting in WMI.

AvgDiskBytesPerWrite_Base

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (1073939458) , DefaultScale (0) , PerfDetail (300)

Base value for AvgDiskBytesPerWrite. This value represents the accumulated number of operations that have taken place.

AvgDiskQueueLength

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (5571840) , DefaultScale (-2) , PerfDetail (100)

Average number of both read and write requests that were queued for the selected disk during the sample interval.

For more information about using uint64 values in scripts, see Scripting in WMI.

AvgDiskReadQueueLength

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (5571840) , DefaultScale (2) , PerfDetail (100)

Average number of read requests that were queued for the selected disk during the sample interval.

For more information about using uint64 values in scripts, see Scripting in WMI.

AvgDiskSecPerRead

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (805438464) , DefaultScale (3) , PerfDetail (200)

Average time, in seconds, of a read operation of data from the disk.

AvgDiskSecPerRead_Base

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (1073939458) , DefaultScale (3) , PerfDetail (200)

Base value for AvgDiskSecPerRead. This value represents the accumulated number of operations that have taken place.

AvgDiskSecPerTransfer

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (805438464) , DefaultScale (3) , PerfDetail (200)

Time, in seconds, of the average disk transfer.

AvgDiskSecPerTransfer_Base

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (1073939458) , DefaultScale (0) , PerfDetail (200)

Base value for AvgDiskSecPerTransfer. This value represents the accumulated number of operations that have taken place.

AvgDiskSecPerWrite

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (805438464) , DefaultScale (3) , PerfDetail (200)

Average time, in seconds, of a write operation of data to the disk.

AvgDiskSecPerWrite_Base

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (1073939458) , DefaultScale (0) , PerfDetail (200)

Base value for AvgDiskSecPerWrite. This value represents the accumulated number of operations that have taken place.

AvgDiskWriteQueueLength

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (5571840) , DefaultScale (2) , PerfDetail (100)

Average number of write requests that were queued for the selected disk during the sample interval. The time base is 100 nanoseconds.

For more information about using uint64 values in scripts, see Scripting in WMI.

Caption

Data type: string
Access type: Read-only

Short textual description for the statistic or metric. This property is inherited from CIM_StatisticalInformation.

CurrentDiskQueueLength

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (65536) , DefaultScale (1) , PerfDetail (100)

Number of requests outstanding on the disk at the time the performance data is collected. It includes requests in service at the time of the snapshot. The value represents an instantaneous length, not an average over a time interval. Multi-spindle disk devices can have multiple requests active at one time, but other concurrent requests await service. This property may reflect a transitory high or low queue length. If the disk drive has a sustained load, the value will be consistently high. Requests experience delays proportional to the length of the queue minus the number of spindles on the disks. This difference should average less than 2 for good performance.

Description

Data type: string
Access type: Read-only

Textual description of the statistic or metric. This property is inherited from CIM_StatisticalInformation.

DiskBytesPerSec

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (272696576) , DefaultScale (-4) , PerfDetail (200)

Rate at which bytes are transferred to or from the disk during write or read operations.

For more information about using uint64 values in scripts, see Scripting in WMI.

DiskReadBytesPerSec

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (272696576) , DefaultScale (-4) , PerfDetail (200)

Rate at which bytes are transferred from the disk during read operations.

For more information about using uint64 values in scripts, see Scripting in WMI.

DiskReadsPerSec

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (272696320) , DefaultScale (0) , PerfDetail (100)

Rate of read operations on the disk.

DiskTransfersPerSec

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (272696320) , DefaultScale (0) , PerfDetail (100)

Rate of read and write operations on the disk.

DiskWriteBytesPerSec

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (272696576) , DefaultScale (-4) , PerfDetail (200)

Rate at which bytes are transferred to the disk during write operations.

For more information about using uint64 values in scripts, see Scripting in WMI.

DiskWritesPerSec

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (272696320) , DefaultScale (0) , PerfDetail (100)

Rate of write operations on the disk.

FreeMegabytes

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (65536) , DefaultScale (0) , PerfDetail (100)

Unallocated space on the disk drive in megabytes.

Frequency_Object

Data type: uint64
Access type: Read-only

Frequency, in ticks per second, of Timestamp_Object. This property is defined by the provider. This property is inherited from Win32_Perf.

For more information about using uint64 values in scripts, see Scripting in WMI.

Frequency_PerfTime

Data type: uint64
Access type: Read-only

Frequency, in ticks per second, of Timestamp_Perftime. A value can be obtained by calling the Windows function QueryPerformanceCounter. This property is inherited from Win32_Perf.

For more information about using uint64 values in scripts, see Scripting in WMI.

Frequency_Sys100NS

Data type: uint64
Access type: Read-only

Frequency, in ticks per second, of Timestamp_Sys100NS (10000000). This property is inherited from Win32_Perf.

For more information about using uint64 values in scripts, see Scripting in WMI.

Name

Data type: string
Access type: Read-only
Qualifiers: Key, MaxLen (256)

Label by which the statistic or metric is known. When sub-classed, the property can be overridden to be a key property. This property is inherited from CIM_StatisticalInformation.

PercentDiskReadTime

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (542573824) , DefaultScale (0) , PerfDetail (100)

Percentage of elapsed time that the selected disk drive is busy servicing read requests.

For more information about using uint64 values in scripts, see Scripting in WMI.

PercentDiskReadTime_Base

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (1073939712) , DefaultScale (0) , PerfDetail (100)

Base value for PercentDiskReadTime.

For more information about using uint64 values in scripts, see Scripting in WMI.

PercentDiskTime

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (542573824) , DefaultScale (0) , PerfDetail (100)

Percentage of elapsed time that the selected disk drive is busy servicing read or write requests.

For more information about using uint64 values in scripts, see Scripting in WMI.

PercentDiskTime_Base

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (1073939712) , DefaultScale (0) , PerfDetail (100)

Base value for PercentDiskTime.

For more information about using uint64 values in scripts, see Scripting in WMI.

PercentDiskWriteTime

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (542573824) , DefaultScale (0) , PerfDetail (100)

Percentage of elapsed time that the selected disk drive is busy servicing write requests.

For more information about using uint64 values in scripts, see Scripting in WMI.

PercentDiskWriteTime_Base

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (1073939712) , DefaultScale (0) , PerfDetail (100)

Base value for PercentDiskWriteTime.

For more information about using uint64 values in scripts, see Scripting in WMI.

PercentFreeSpace

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (537003008) , DefaultScale (0) , PerfDetail (100)

Ratio of the free space available on the logical disk unit to the total usable space provided by the selected logical disk drive.

PercentFreeSpace_Base

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (1073939459) , DefaultScale (0) , PerfDetail (100)

Base value for PercentFreeSpace.

PercentIdleTime

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (542573824) , DefaultScale (0) , PerfDetail (200)

Percentage of time during the sample interval that the disk was idle.

For more information about using uint64 values in scripts, see Scripting in WMI.

PercentIdleTime_Base

Data type: uint64
Access type: Read-only
Qualifiers: CounterType (1073939712) , DefaultScale (0) , PerfDetail (100)

Base value for PercentIdleTime.

For more information about using uint64 values in scripts, see Scripting in WMI.

SplitIOPerSec

Data type: uint32
Access type: Read-only
Qualifiers: CounterType (272696320) , DefaultScale (0) , PerfDetail (200)

Rate at which I/Os to the disk were split into multiple I/Os. A split I/O may result from requesting data in a size that is too large to fit into a single I/O or because the disk is fragmented.

Timestamp_Object

Data type: uint64
Access type: Read-only

Object-defined timestamp, defined by the provider. This property is inherited from Win32_Perf.

For more information about using uint64 values in scripts, see Scripting in WMI.

Timestamp_PerfTime

Data type: uint64
Access type: Read-only

High Performance counter timestamp. A value can be obtained by calling the Windows function QueryPerformanceCounter. This property is inherited from Win32_Perf.

For more information about using uint64 values in scripts, see Scripting in WMI.

Timestamp_Sys100NS

Data type: uint64
Access type: Read-only

Timestamp value in 100 nanosecond units. This property is inherited from Win32_Perf.

For more information about using uint64 values in scripts, see Scripting in WMI.

Remarks

All classes derived from Win32_Perf are designed to be used with a refresher object. For more information about how to create and use a refresher object in C++, see Accessing Performance Data in C++. For more information about how to create and use a refresher object using scripts, see Refreshing WMI Data in Scripts.

The performance class and property qualifiers determine how to interpret the class data. For more information, see Class Qualifiers for Performance Counter Classes and Property Qualifiers for Performance Counter Classes.

Examples

For script code examples, see WMI Tasks for Scripts and Applications and the TechNet ScriptCenter Script Repository.

For C++ code examples, see WMI C++ Application Examples.

Requirements

Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Namespace	\root\CIMV2
DLL	Wbemperf.dll on Windows Server 2003 and Windows XP; WmiPerfInst.dll on Windows Server 2008 and Windows Vista

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Win32_PerfRawData_PerfDisk_LogicalDisk class

Syntax

Members

Properties

Remarks

Examples

Requirements

See also

Community Additions