Logical Disk Object

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.

Free Space

Percent Free Space is the ratio of the free space available on the logical disk unit to the total usable space provided by the selected logical disk drive

Detail Level: Novice
Counter Type: PERF_RAW_FRACTION

% Free Space

Percent Free Space is the ratio of the free space available on the logical disk unit to the total usable space provided by the selected logical disk drive

Detail Level: Novice
Counter Type: PERF_RAW_BASE

Free Megabytes

Free Megabytes displays the unallocated space on the disk drive in megabytes. One megabyte = 1,048,576 bytes.

Detail Level: Novice
Counter Type: PERF_COUNTER_RAWCOUNT

Current Disk Queue Length

Current Disk Queue Length is the 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. This is an instantaneous length, not an average over the time interval. Multi-spindle disk devices can have multiple requests 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 are experiencing delays proportional to the length of this queue minus the number of spindles on the disks. This difference should average less than 2 for good performance.

Detail Level: Novice
Counter Type: PERF_COUNTER_RAWCOUNT

% Disk Time

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

Detail Level: Novice
Counter Type: PERF_COUNTER_TIMER

Avg. Disk Queue Length

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.

Detail Level: Novice
Counter Type: 0x450500,

% Disk Read Time

Disk Read Time is the percentage of elapsed time that the selected disk drive is busy servicing read requests.

Detail Level: Novice
Counter Type: PERF_COUNTER_TIMER

Avg. Disk Read Queue Length

Avg. Disk Read Queue Length is the average number of read requests that were queued for the selected disk during the sample interval.

Detail Level: Novice
Counter Type: 0x450500,

% Disk Write Time

Avg. Disk Read Queue Length is the average number of read requests that were queued for the selected disk during the sample interval.

Detail Level: Novice
Counter Type: PERF_COUNTER_TIMER

Avg. Disk Write Queue Length

Avg. Disk Write Queue Length is the average number of write requests that were queued for the selected disk during the sample interval.

Detail Level: Novice
Counter Type: 0x450500,

Avg. Disk sec/Transfer

Avg. Disk sec/Transfer is the time in seconds of the average disk transfer.

Detail Level: Advanced
Counter Type: PERF_AVERAGE_TIMER

Avg. Disk sec/Transfer

Avg. Disk sec/Transfer is the time in seconds of the average disk transfer.

Detail Level: Advanced
Counter Type: PERF_AVERAGE_BASE

Avg. Disk sec/Read

Avg. Disk sec/Read is the average time in seconds of a read of data from the disk.

Detail Level: Advanced
Counter Type: PERF_AVERAGE_TIMER

Avg. Disk sec/Read

Avg. Disk sec/Read is the average time in seconds of a read of data from the disk.

Detail Level: Advanced
Counter Type: PERF_AVERAGE_BASE

Avg. Disk sec/Write

Avg. Disk sec/Write is the average time in seconds of a write of data to the disk.

Detail Level: Advanced
Counter Type: PERF_AVERAGE_TIMER

Avg. Disk sec/Write

Avg. Disk sec/Write is the average time in seconds of a write of data to the disk.

Detail Level: Advanced
Counter Type: PERF_AVERAGE_BASE

Disk Transfers/sec

Disk Transfers/sec is the rate of read and write operations on the disk.

Detail Level: Novice
Counter Type: PERF_COUNTER_COUNTER

Disk Reads/sec

Disk Reads/sec is the rate of read operations on the disk.

Detail Level: Novice
Counter Type: PERF_COUNTER_COUNTER

Disk Writes/sec

Disk Writes/sec is the rate of write operations on the disk.

Detail Level: Novice
Counter Type: PERF_COUNTER_COUNTER

Disk Bytes/sec

Disk Bytes/sec is the rate bytes are transferred to or from the disk during write or read operations.

Detail Level: Advanced
Counter Type: PERF_COUNTER_BULK_COUNT

Disk Read Bytes/sec

Disk Read Bytes/sec is the rate bytes are transferred from the disk during read operations.

Detail Level: Advanced
Counter Type: PERF_COUNTER_BULK_COUNT

Disk Write Bytes/sec

Disk Write Bytes is rate bytes are transferred to the disk during write operations.

Detail Level: Advanced
Counter Type: PERF_COUNTER_BULK_COUNT

Avg. Disk Bytes/Transfer

Avg. Disk Bytes/Transfer is the average number of bytes transferred to or from the disk during write or read operations.

Detail Level: Expert
Counter Type: PERF_AVERAGE_BULK

Avg. Disk Bytes/Transfer

Avg. Disk Bytes/Transfer is the average number of bytes transferred to or from the disk during write or read operations.

Detail Level: Expert
Counter Type: PERF_AVERAGE_BASE

Avg. Disk Bytes/Read

Avg. Disk Bytes/Read is the average number of bytes transferred from the disk during read operations.

Detail Level: Expert
Counter Type: PERF_AVERAGE_BULK

Avg. Disk Bytes/Read

Avg. Disk Bytes/Read is the average number of bytes transferred from the disk during read operations.

Detail Level: Expert
Counter Type: PERF_AVERAGE_BASE

Avg. Disk Bytes/Write

Avg. Disk Bytes/Write is the average number of bytes transferred to the disk during write operations.

Detail Level: Expert
Counter Type: PERF_AVERAGE_BULK

Avg. Disk Bytes/Write

Avg. Disk Bytes/Write is the average number of bytes transferred to the disk during write operations.

Detail Level: Expert
Counter Type: PERF_AVERAGE_BASE

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