Solved

disk queue length

Posted on 2013-01-19
4
536 Views
Last Modified: 2013-02-07
i have a hp raid 10 array with 6 disks, what is the threshold for disk queue length? is it 2 per disk? so in my case it would 12?
0
Comment
Question by:Kylo Ren
  • 2
4 Comments
 
LVL 11

Assisted Solution

by:gmbaxter
gmbaxter earned 250 total points
Comment Utility
If the average disk queue length is greater than twice the number of disks in the volume/array then the storage is the bottleneck, so in your case yes 12.

You could certainly look into the average read and average write indications separately to get further information.
0
 
LVL 78

Expert Comment

by:David Johnson, CD, MVP
Comment Utility
@gmbaxter: Yes that is the theory.. Whether or not it affects the user experience is another question. On my drive E (6 Drives in a Storage Space) the current disk queue is 58 (I am pausing a Vmware workstation), yet it doesn't impact my other running applications..
0
 
LVL 11

Expert Comment

by:gmbaxter
Comment Utility
Yes it does depend on the application in that respect. In a 16 disk array running user home folders I've seen queues of 35 severely affecting performance.

The main thing to do is to analyse the issue, if you view the application as a user at peak times and you think there is a problem, then look into where the problem originates from. If however things are running smoothly, then don't just throw money at a san/array just because a graph says so.
0
 
LVL 2

Accepted Solution

by:
MaxEL_UA earned 250 total points
Comment Utility
Here is a TechNet article for bottleneck calculations
http://technet.microsoft.com/en-us/library/dd723635%28v=office.12%29.aspx
0

Featured Post

Do email signature updates give you a headache?

Constantly trying to correctly format email signatures? Spending all of your time at every user’s desk to make updates? Want high-quality HTML signatures on all devices, including on mobiles and Macs? Then, let Exclaimer solve all your email signature problems today!

Join & Write a Comment

Every now and then, Microsoft does something that totally impresses me. It doesn't happen often, but in this case I must say I am thoroughly impressed with Windows Server Backup. One of the long time issues with Windows Backup has been the ability t…
Understanding the various editions available is vital when you decide to purchase Windows Server 2012. You need to have a basic understanding of the features and limitations in each edition in order to make a well-informed decision that best suits y…
In this Micro Tutorial viewers will learn how to use Boot Corrector from Paragon Rescue Kit Free to identify and fix the boot problems of Windows 7/8/2012R2 etc. As an example is used Windows 2012R2 which lost its active partition flag (often happen…
This tutorial will walk an individual through the process of configuring their Windows Server 2012 domain controller to synchronize its time with a trusted, external resource. Use Google, Bing, or other preferred search engine to locate trusted NTP …

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now