Tuesday, June 18, 2013

Disk Usage (QueueLenght) monitoring - why my machine is not responding if CPU and Memory is doing good.

For a last year I saw many times that it is not CPU or Memory that is stopping system from responding quickly, it is hard drive that is the weakest link. A typical QueueLength (number of processes waiting for HD resource) should be around 0.05 or better 0.01 as illustrated below. (In order to see this screen hit open Windows Task Manager (ctr+shift+Esc)-> performance->Resource Monitor->Disk).

But if there are many processes trying to write on hd this diagram looks like this:

It means that HD is a major bottle neck in a system.

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