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Physical Disk Object
The Physical Disk performance object consists of counters that monitor hard or
fixed disk drive on a computer. Disks are used to store file, program, and
paging data and are read to retrieve these items, and written to record changes to
them. The values of physical disk counters are sums of the values of the
logical disks (or partitions) into which they are divided.
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
Disk Write Time is the percentage of elapsed time that the selected disk drive
is busy servicing write requests.
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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