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5:05am disk activity warning in the Event log of a SBS 2003 Server...

Every morning at 5:05am I get this in the Event log of a SBS 2003 Server:  Does anyone know what can be causing this?
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The following disk has low idle time, which may cause slow response time when reading or writing files to the disk.

Disk: 0 C:

Review the Disk Transfers/sec and % Idle Time counters for the PhysicalDisk performance object. If the Disk Transfers/sec counter is consistently below 150 while the % Idle Time counter remains very low (close to 0), there may be a problem with the disk driver or hardware.

If the review shows that the disk is functioning properly, use Task Manager to determine which processes are causing the majority of the disk activity. You can attempt to correct the problem by stopping and then restarting those processes.

You can disable this alert or change its threshold by using the Change Alert Notifications task in the Server Management Monitoring and Reporting taskpad."
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I've seen the post re adding the "/3GB  /USERVA=3030" to the boot.ini... but am a little worried about doing so. Would appreciate some insight from anyone that's seen this before.

Much obliged,

E
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Olaf De CeusterCommented:
At 5am in the morning start monitoring the services in Task Manager.
It will probably be Backup, Anti-Virus scan or reporting (Sql)
Can't hurt to see if there are any updated drivers for your HDD.
Olaf
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Olaf De CeusterCommented:
I saw your second question.
Can you please make sure that Symantec (Don't use that product anymore so it has been a while) is not scanning any of your exchange services and files like NTDS, SYSVOL, an IINet DB's for starters.
Your BU HDD is USB??
Olaf
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hb-fcsiCommented:
I was getting the same alert on my SBS2003.  Our server would come to a crawl during certain processes and everything seemed to point to either the SQL or the backup process.  It turned out that there was a problem with one of the drives in my RAID 1 set.  Unfortunately, the drive error was not easy to find.  We have an HP ML350 and the "HP Systems Management Homepage" tool did not show any failures on the drive.  But when I looked more closely, one of the drives had a significant number of "Hard Read Errors".  So then I ran a full offline diagnostic from the SmartStart CD and it found that 1 of the 2 drives had failed.  I took that info and had HP send me a replacement drive.  After replacing the failed drive and letting the RAID set rebuild itself, everything went back to normal.

I'd seen a number of posts online that had the same SBS error in the event log:

"The following disk has low idle time, which may cause slow response time when reading or writing files to the disk."

So I thought I'd post my experience.  Hopefully this helps someone else who experiences this problem.  
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