The Logical Disk performance object consists of counters that monitor logical partitions of a hard or fixed disk drives. Performance Monitor identifies logical disks by their a drive letter, such as C.
Namespace value is root/CIMV2.
WMI Provider value is WmiPerfInst.
Avg. Disk Bytes/Read is the average number of bytes transferred from the disk during read operations.
Avg. Disk Bytes/Transfer is the average number of bytes transferred to or from the disk during write or read operations.
Avg. Disk Bytes/Write is the average number of bytes transferred to the disk during write operations.
Avg. Disk Queue Length is the average number of both read and write requests that were queued for the selected disk during the sample interval.
Avg. Disk Read Queue Length is the average number of read requests that were queued for the selected disk during the sample interval.
Avg. Disk sec/Read is the average time, in seconds, of a read of data from the disk.
Avg. Disk sec/Transfer is the time, in seconds, of the average disk transfer.
Avg. Disk sec/Write is the average time, in seconds, of a write of data to the disk.
Avg. Disk Write Queue Length is the average number of write requests that were queued for the selected disk during the sample interval.
A short textual description (one-line string) for the statistic or metric.
Current Disk Queue Length is the number of requests outstanding on the disk at the time the performance data is collected. It also includes requests in service at the time of the collection. This is a instantaneous snapshot, not an average over the time interval. Multi-spindle disk devices can have multiple requests that are active at one time, but other concurrent requests are awaiting service. This counter might reflect a transitory high or low queue length, but if there is a sustained load on the disk drive, it is likely that this will be consistently high. Requests experience delays proportional to the length of this queue minus the number of spindles on the disks. For good performance, this difference should average less than two.
A textual description of the statistic or metric.
Disk Bytes/sec is the rate bytes are transferred to or from the disk during write or read operations.
Disk Read Bytes/sec is the rate at which bytes are transferred from the disk during read operations.
Disk Reads/sec is the rate of read operations on the disk.
Disk Transfers/sec is the rate of read and write operations on the disk.
Disk Write Bytes/sec is rate at which bytes are transferred to the disk during write operations.
Disk Writes/sec is the rate of write operations on the disk.
Free Megabytes displays the unallocated space, in megabytes, on the disk drive in megabytes. One megabyte is equal to 1,048,576 bytes.
The Name property defines the label by which the statistic or metric is known. When subclassed, the property can be overridden to be a Key property.
% Disk Read Time is the percentage of elapsed time that the selected disk drive was busy servicing read requests.
% Disk Time is the percentage of elapsed time that the selected disk drive was busy servicing read or write requests.
% Disk Write Time is the percentage of elapsed time that the selected disk drive was busy servicing write requests.
% Free Space is the percentage of total usable space on the selected logical disk drive that was free.
% Idle Time reports the percentage of time during the sample interval that the disk was idle.
Split IO/Sec reports the rate at which I/Os to the disk were split into multiple I/Os. A split I/O may result from requesting data of a size that is too large to fit into a single I/O or that the disk is fragmented.
Method not found.
SELECT * FROM Win32_PerfFormattedData_PerfDisk_LogicalDisk
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WMI Environment is Windows Server 2008 R2 Enterprise Edition.
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