Exchange on SBS 2003 is slow to respond

Hi all,
We have SBS 2003 server running on a quad-core HP server with 4GB RAM and plenty of storage space. A few days ago we hit the set limit in the registry for the DB size so increased it and restarted the IS. That night IS Maintenance ran OK and showed 6GB free in the DB.

The server is responding slowly throughout the business day. It seems slow for a while and then is very responsive for 5-10 seconds, then slows down again.

We are receiving the following errors during times when the sever is responding slowly.

Event Type:      Warning
Event Source:      ESE
Event Category:      Performance
Event ID:      508
Date:            24/03/2010
Time:            12:09:00 PM

Description:
Information Store (876) First Storage Group: A request to write to the file "E:\Exchsrvr\MDBDATA\E00.chk" at offset 0 (0x0000000000000000) for 4096 (0x00001000) bytes succeeded, but took an abnormally long time (100 seconds) to be serviced by the OS. This problem is likely due to faulty hardware. Please contact your hardware vendor for further assistance diagnosing the problem.



Event Type:      Warning
Event Source:      MSExchangeIS Mailbox Store
Event Category:      Views
Event ID:      1173
Date:            24/03/2010
Time:            11:16:49 AM

Description:
Error 0x6bb deleting unused restricted view from folder 28-F2249E on database "First Storage Group\Mailbox Store (xxx)". Microsoft Exchange Information Store will try to delete the view again at the next maintenance interval.


The maintenance window does not conflict with the backup window. I have run the SBS 2003 BPA and Exchange 2003 BPA. Neither show anything to worry about.

Any suggestions?

Cheers,
Paul.
bbd_auAsked:
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goldenoakCommented:
It sounds like you may have a bad disk or controller.  I suggest you make sure you have a good backup and run a confidence check on the server hard drives.  Is it a single drive or hardware or software RAID?   Check the system log for disk errors at the same time as the Exchange errors.
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bbd_auAuthor Commented:
Thank you for the responses:
- There are no disk errors in the event log.
- There are 3 SAS drives on a P400i controller in RAID 5.

I have found an updated driver for the controller which I will install in a few hours when I can schedule downtime. I have also downloaded the latest HP Maintenance CD which I may run during the same downtime period.

Cheers,
Paul.
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bbd_auAuthor Commented:
I should also mention we get a high disk queue length when this occurs.
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goldenoakCommented:
I would check the array before you install that driver.  make sure that the controller thinks it is healthy.  You may be having recoeverable disk errors that the controller is correcting, but it's taking some time for it to process.  Be careful about updating the driver if the array manager indicates some kind of problem.
Make sure you have a good backup before you update that driver.
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bbd_auAuthor Commented:
Well, updating the driver did not seem to fix. I also updated all firmware. The array appears to be healthy.

Last night I came across the comment from "jchri66" in the Open Discussion part of this question that I am currently investigating
http://www.experts-exchange.com/Storage/Misc/Q_24032952.html
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