How do I equate those values to a number like ? All those numbers do nothing but go up So to find out how bad things were between my two readings, do I need to subtract one from the other and divide by some magic number and then take the inverse reciprocal of the square root? It feels about that opaque to me, right now. Yes and no It's been almost a year, so my memory and my own doc are a bit fuzzy, but here's what I found out. And it's little wonder my question stumped the internet!
If you take an example of AvgDiskWriteQueueLength in order to find out how to get a "cooked" value from the raw value, you have to jump through these hoops: 1. From that website get the counter type and translate that counter type name into what appears to be a completely random numerical value in this case it's 3.
But then you have to decipher what the formula means. They'd be perfect for the job. Stumbled across this thread looking for something else but I'm using powershell to get these cooked values automatically. Office Office Exchange Server. Not an IT pro? Learn More.
Windows Server TechCenter. Sign in. United States English. If you have multiple drives you should take this number and divide by the number of drives in the array to see if the number is above 2.
For example, you have 4 drives and a disk queue length of 10, this would be 2. If the answer is helpful, please click "Accept Answer" and upvote it. Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. Or it's from other server , because it's on a SAN environment. Queue length refers to the number of outstanding IO requests that are in the queue to be sent to the disk.
This is measured as an absolute number of requests. Here is what the test shows:. These results show that the disk is clearly a bottleneck and underperforming for the workload.
Both the write latency and write queue are very high. If this were a real environment, we would be digging deeper into the storage to see where the issue is. It could be that there's a problem on the storage side like a bad drive or a misconfiguration , or that the storage is simply too slow to handle the workload.
These are general rules and may not apply in every scenario. However, if you see the counters exceeding the thresholds above, it warrants a deeper investigation. If a disk performance issue is suspected to be causing a larger problem, we generally start off by running the second set of counters above.
This will determine if the storage is actually a bottleneck, or if the problem is being caused by something else. If the counters indicate that the disk is underperforming, we would then run the first set of counters to see how many IOPS and how much throughput we are getting. From there, we would determine if the storage is under-spec'ed or if there is a problem on the storage side. A logical disk can consist of many physical disks.
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. Disk Queue Length Ask Question. Asked 9 years, 2 months ago. Active 7 years, 4 months ago. Viewed 19k times. Improve this question. Add a comment.
0コメント