Windows Resource Monitor shows a graph of Disk Queue Length. E.g.:
What does the green graph, and the blue line represent:
Research Effort
- In the Resource Monitor of Windows 7, what does the "disk queue length" really mean? (it's not Disk I/O and Highest Active Time)
- Technet: Performance and Reliability Monitoring Getting Started Guide for Windows Server 2008
It is not Disk I/O and Highest Active Time
Don't forget, it is not Disk I/O and Highest Active Time, because it can't be both things for both graphs. Because both graphs are different.
- if it were the same thing
- for both graphs
- then both graphs would be the same
Also, one graph is Disk I/O (in MB/sec), and the other is Queue Length (in number).
22 Answers
Green is the Disk I/O in KB/second
Blue is % Highest active time
Windows 10 fixed the issue, and the confusion.
The confusion was that:
- each Physical Disk had a blue line
- which supposedly represented "highest active time"
But then how can every Physical Disk have the same highest active time?
Answer: they don't. The blue line has nothing to do with any particular physical disk.
So in Windows 10 the blue line was removed from everything except the aggregated pseudo-physical disk "Disk".
