LogicalDisk Object
Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2
The LogicalDisk performance object consists of counters that monitor logical partitions of hard or fixed disk drives. System Monitor identifies logical disks by their drive letter, such as "C."
| Counter Name | Description | Counter Type |
|---|---|---|
% Disk Time |
Shows the percentage of time that the selected disk drive was busy servicing read or write requests. |
|
% Disk Read Time |
Shows the percentage of time that the selected disk drive was busy servicing read requests. |
|
% Disk Write Time |
Shows the percentage of time that the selected disk drive was busy servicing write requests. |
|
% Free Space |
Shows the percentage of the total usable space on the selected logical disk drive that was free. |
|
Avg. Disk Bytes/Read |
Shows the average number of bytes transferred from the disk during read operations. |
|
Avg. Disk Bytes/Transfer |
Shows the average number of bytes transferred to or from the disk during write or read operations. |
|
Avg. Disk Bytes/Write |
Shows the average number of bytes transferred to the disk during write operations. |
|
Avg. Disk Queue Length |
Shows 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 |
Shows the average number of read requests that were queued for the selected disk during the sample interval. |
|
Avg. Disk sec/Read |
Shows the average time, in seconds, of a read operation from the disk. |
|
Avg. Disk sec/Transfer |
Shows the time, in seconds, of the average disk transfer. |
|
Avg. Disk sec/Write |
Shows the average time, in seconds, of a write operation to the disk. |
|
Avg. Disk Write Queue Length |
Shows the average number of write requests that were queued for the selected disk during the sample interval. |
|
Current Disk Queue Length |
Shows the number of requests outstanding on the disk at the time that the performance data is collected. It also includes requests in service at the time of the collection. This is a snapshot, not an average over a time interval. Multispindle 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 that are 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. |
|
Disk Bytes/sec |
Shows the rate, in incidents per second, at which bytes were transferred to or from the disk during write or read operations. |
|
Disk Read Bytes/sec |
Shows the rate, in incidents per second, at which bytes were transferred from the disk during read operations. |
|
Disk Reads/sec |
Shows the rate, in incidents per second, at which read operations were performed on the disk. |
|
Disk Transfers/sec |
Shows the rate, in incidents per second, at which read and write operations were performed on the disk. |
|
Disk Write Bytes/sec |
Shows the rate, in incidents per second, at which bytes were transferred to the disk during write operations. |
|
Disk Writes/sec |
Shows the rate, in incidents per second, at which write operations were performed on the disk. |
|
Free Megabytes |
Shows the unallocated space, in megabytes, on the disk drive. One megabyte is equal to 1,048,576 bytes. |