High value of the Avg. Disk Queue Length

Hello, we are running Small Business Server 2003 on HP Proliant 380G3 and there is problem with the average values of the Disk Queue Length. There is moments when the average value is over 2 and the people on the workstations are complaining the everything is too slow. We just upgraded the memory so now the memory utilization is under 30%. Is there any way to reduce the average value for the Disk Queue Length?
goliveukAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

suppsawsCommented:
Hello goliveuk,

Did you already check which process is causing the disk slowdown?
You could use Diskmon/filemon or check the  I/O writes I/O reades on the task manager.

Regards,

suppsaws
0
suppsawsCommented:
goliveuk,

http://technet.microsoft.com/nl-be/sysinternals/bb896653(en-us).aspx
this was the one I was looking for

suppsaws
0
Duncan MeyersCommented:
>Is there any way to reduce the average value for the Disk Queue Length?
Yes - as a general rule - add more discs. How many users on your server and what apps are you running? Presumably Exchange at the least. Can you also provide more information about the physical configuration of the server?

Moments of Disk Queue Length >2 is OK - high disk queue length for extended periods is not. There are other counters you need to check:

If % Disk Time is over 55% when the Avg. Disk Queue Length counter is over 2 per physical disk indicates an I/O bottleneck
Avg Disk sec/read and Avg Disk sec/write should be under 10ms. Over 20 ms indicates a possible bottleneck

And many, many more.

This is a good article to review before you go too much further: http://www.oreillynet.com/pub/a/network/2002/01/18/diskperf.html
0
Powerful Yet Easy-to-Use Network Monitoring

Identify excessive bandwidth utilization or unexpected application traffic with SolarWinds Bandwidth Analyzer Pack.

goliveukAuthor Commented:
Will and upgrade with battery-backed write cache solve that problem ?
0
goliveukAuthor Commented:
Yes there is exchange running, and the users are over 15
0
Duncan MeyersCommented:
How many discs are there in the server and how are they configured? (RAD 1, RAID 5 etc).
0
goliveukAuthor Commented:
There are three disks - RAID5
0
Duncan MeyersCommented:
What other applications are running? Your system should cope with ease with 15 users - although be aware of the performance hit caused by the RAID 5 write penalty. Is there a really heavily disc intensive application installed?
0
goliveukAuthor Commented:
There is not other heavy application. How can I monitor different instances on the server 2003 and determine which process (or user) is causing the Average Disk Queue Length to rocket high from time to time?
0
Duncan MeyersCommented:
Use suppsaws' suggestion. A combintaion of filemon.exe: http://technet.microsoft.com/en-us/sysinternals/bb896642.aspx and Process Explorer: http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx will help you track the process down.

Be careful, though. It isn't necessarily a program that's causing the issue. You may have a hardware problem or a driver that needs updating. It would pay you to go through the exercise of updating the RAID controller drivers and BIOS and the system BIOS as well.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Duncan MeyersCommented:
Thanks! What fixed your problem in the end?
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Server Hardware

From novice to tech pro — start learning today.