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Disk Queue Length
The most common performance monitoring metric people quote is usually disk queue length. Disk queue length usually means the length
(in number of I/O operations) of the queue of pending operations for a given disk. In other words, how many requests have stacked up waiting for the disk drive
to be able to service them. As an example, if I can only process one request a second, but I get 6 requests in a given second, then my queue length will initially
be 5 (one request is processed immediately, the five remaining must be queued).
Multispindle 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 is 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 two for good performance.
Our Drives Monitor gadget
can show you your disk queue length in a real time. The value represents an instantaneous length, not an average over a time interval.