Windows perfmon avg disk queue length

If the virtual machines are not running Windows Server R2, you should add more network adapters. If your workload is storage-intensive, you should enable virtual NUMA and add more virtual disks. If you are using Dynamic Memory, you should increase the maximum memory setting. If your workloads can't meet their network latency, enable SR-IOV to present physical network adapter resources to the virtual machine.

The Avg. Disk Queue Length counter is derived from the product of Avg. Again, this corresponds to a well-known theorem of Queuing Theory called Little's Law, which states:. So the Avg. Disk Queue Length counter is an estimate of the number of outstanding requests to the Logical or Physical disk. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?

Learn more. Asked 12 years, 6 months ago. Active 9 years, 5 months ago. Viewed 5k times. A graph of this is as follows: where the purple line corresponds to the total average disk queue length and the green line corresponds to the current disk queue length. Improve this question. If we constantly get a counter value of more than 20ms then it means our disk is not performing well. Average Disk Queue Length counter shows us the average number of read and write requests that were queued on the selected physical disk.

This helps us to diagnose whether the Average Disk Queue Length is high due to high read or high write operation. The recommended value for this counter is less than 2 per individual disk. Current Disk Queue Length is the number of disk requests that are currently waiting as well as requests currently being serviced. The difference between average disk queue length and current queue length is CDQL tells current load whereas ADQL tells load during a given time frame. The Current Disk Queue Length value should be less than 2 per disk.

If we want to benchmark disk capacity we can do it by gradually increasing the load on the system. It shows the values as a normal one even the disk has a serious disk performance issue. We are happy to help you]. To conclude we saw how to use Perfmon Counters for disk usage. Also, we saw some commonly used performance counters which our Support Engineers use to identify SQL server disk bottlenecks.

Never again lose customers to poor server speed! Let us help you. Your email address will not be published. Skip to main content. Find threads, tags, and users Comment Show 0. Current Visibility: Visible to all users. Hi sakuraime , A high Avg.