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Intermittent high disk queue and disk time reported by performance monitor. Server runs like a turtle.

Posted on 2008-06-23
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I have a ML530 server that we are experiencing intermittent performance issues with. According to the HP insight manager the server is healthy, however it can take up to 1-2 minutes at times to simply browse a directory saving large files can be much worse. Performance monitor is indicating that during these times of degredated performance the disk queue is high as is the % of disk utilization. We have run a complete defrag on all drives which resulted in little or no performance benefit.  
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Question by:sheahomes
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by:cuziyq
ID: 21846665
What kind of server is it?  File server?  SQL server?  E-mail?

Are the disks local to this machine or is it booting from a SAN?

Also, is there any software running on it that might be producing high disk I/O?
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by:jhoop2002
ID: 21846739
I had similar problems with an older ML.  It turned out to be the array controller.  I just enlisted the help of my local hp tech, he found the problem got the replacement parts and installed them.
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by:sheahomes
ID: 21846926
It is a file server. The drives are located in the server. Only software running on the box is NAV 10.1.5 and Backupexec 11d (idle until 1am) and Undelete 5.0. I have my suspicions about the controller, but its merely a theory as HP insight manager indicates it is healthy.
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by:jhoop2002
ID: 21846959
yea, we didn't think it was the controller either until the box froze and when we restarted it, it stopped because it couldn't initialize the array.

It seemed to always be brought on by someone saving or opening a large file.
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by:sheahomes
ID: 21847004
When your controller died did it kill the array or were you able to replaced the controller and save the existing array and if so what was involved.
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by:jhoop2002
ID: 21847870
We were able to swap another controller in without problem.  Just make sure your replacement is exactly the same.

As always make sure you have good backup's before hand.
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sheahomes earned 0 total points
ID: 21868925
Issues was caused by drive corruption. Scheduled a CHKDSK / F on all volumes at boot and errors were found and corrected. Thank to all that responded.
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by:jhoop2002
ID: 21868945
was it an actual Hard Drive going bad, or just corruption within the volume?  Because a controller that is failing can cause that.  Just keep an eye on it, if don't have any more problems then you don't have anything to worry about.
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