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10.02.2007 at 09:05PM PDT, ID: 22868359
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Windows 2003 Disk Queue at 100%
Tags: disk, queue, 2003, windows, average
In Performance Monitor, the Average Disk Queue is flatlining at 100%.  Obviously, users are complaining about slow response times when accessing data.

Is there a quick way to find out which process is hammering the disks?

I've restarted the SQL services and print spooler.
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Question Stats
Zone: Software
Question Asked By: lrkwalkers
Solution Provided By: dfxdeimos
Participating Experts: 2
Solution Grade: A
Views: 135
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10.02.2007 at 09:07PM PDT, ID: 20003928

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10.02.2007 at 09:25PM PDT, ID: 20003966

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10.02.2007 at 09:26PM PDT, ID: 20003974

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10.02.2007 at 09:28PM PDT, ID: 20003978

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10.02.2007 at 09:32PM PDT, ID: 20003996

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10.02.2007 at 09:56PM PDT, ID: 20004061

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10.02.2007 at 09:57PM PDT, ID: 20004065

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10.02.2007 at 10:02PM PDT, ID: 20004081

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10.02.2007 at 09:07PM PDT, ID: 20003928
Sorry - it's Average Disk Queue Length.
 
10.02.2007 at 09:25PM PDT, ID: 20003966
Irkwalkers,

"Avg. Disk Queue Length" is a measure of the items waiting to be written into the disk. It is displayed as number of write operations in the cue, not percent.

According to Microsoft disk queue lengths should not exceed 4 or you will start noticing performance issues. I noticed that you mentioned SQL server, which is a VERY I/O intensive service. If you combined this with say, Active Directory or DNS you could run into a hard disk bottleneck.

Easy way to check what is using the most I/O is to open your Task Manager ( Ctrl. + Alt. + Delete or Right Click on Taskbar and choose Task Manager ). Go to "View" at the top and choose "Select Columns..." then check "I/O Reads", "I/O Writes", and "I/O Other", click "OK". You will then see them appear next to the corresponding process.

You should be able to track down that high I/O offender now! =]
Accepted Solution
 
10.02.2007 at 09:26PM PDT, ID: 20003974
" "Avg. Disk Queue Length" is a measure of the items waiting to be written into the disk. It is displayed as number of write operations in the cue, not percent. "

Should have read:

" "Avg. Disk Queue Length" is a measure of write operations waiting at the disk to be written. It is displayed as number of write operations in the cue, not percent. "

Not "Items" but "Write Operations"

Sorry.
 
10.02.2007 at 09:28PM PDT, ID: 20003978
More likely than not the bottleneck is caused by SQL and your disk layout.  I have listed some links below on monitoring the server and best practices:
http://sqljunkies.com/Article/D1B7C756-4725-4D31-A53D-C0A47976E6BB.scuk
http://msdn2.microsoft.com/en-us/library/ms175903.aspx
http://www.microsoft.com/technet/prodtechnol/sql/2000/maintain/sqlops6.mspx
 
10.02.2007 at 09:32PM PDT, ID: 20003996
Avg. Disk Queue Length is the average number of both read and write requests that were queued for the selected disk during the sample interval.

Generally you want to seperate your log files from your database files and you do not want to put the logs on a RAID5, use RAID10 instead.  Any RAID setup will work for the database files.
 
10.02.2007 at 09:56PM PDT, ID: 20004061
Points awarded.

Solution in the end:

We have GFI Mail Archiver and we recently put another Exchange server into our domain for another site.  Since GFI Mail Archiver wasn't licensed for all the extra users, we are assuming that the email data was trying to archive but couldn't due to the lack of licenses.  Once we took the email archive databases offline, the disk queue went back to normal.
 
10.02.2007 at 09:57PM PDT, ID: 20004065
Why is it recommended that the log files be separated from the database files?  Do you mean on another RAID array or logical drive?
 
10.02.2007 at 10:02PM PDT, ID: 20004081
Different physical disk (be it RAID or not).  Transaction logs are accessed sequentially, database files are random.  If DB files are located on different disks then you have parallel I/O.
 
 
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