SBS 2011 on HP ML 350G6 Server is getting slow / 100 % CPU Usage

Dear all,

the SBS 2011 server with 2 Raid 1 (mirrored) volumes of 146 GB and 300 GB , 24 GB Ram, and 8 Core CPU at 2,4 GHZ is getting stuck from time to time with having CPU0 at 100%.

When looking into the task manager or resource monitor I can see that CPU0 gets at 100% but there is no service, task or programm visible causing it.

Volume Shadow Service is active on both volumes. Could it be related to this?

The harddrive only show some peaks but are not running permanently at 100%. It is likely 30% or less.

The event log shows a  VSS-error "1376" with event id 8230 from source VSS that spearch could not be resolved. Registrykey VssAccessControl should be reviewed.
Some sources state that this error can be ignored as it is not really an issue.

Can someone please point me to the right direction?

Thank you!


Christian Wirth.
Who is Participating?
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
The only service we have seen native to SBS that causes a core to be pinned is the Exchange Search service.

Use ProcessExplorer to see what is causing the 100%:

ChristianWirthAuthor Commented:
Thanks for your tip.
Process Explorer doesn't show any problems either.

Please find the screenshots attached

Process Explorer Screenshot at 100%

 Recource Mon with CPU at 100%
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
How many cores installed on the server?

It is Exchange Search shown in the second shot.

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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Remember, 100% of _one_ core will only be a percentage of the whole. 4 cores then 1 process running a core at 100% will = 25% of CPU, 8 cores then = 12.5% and so on.

ChristianWirthAuthor Commented:
Thank you for your help.

I will check the Exchange Search Service (even it shows only max 14%) .
The CPU has 8 cores, the later cores even do have no spikes at most of the tmes.

The problem is that the 100% spike at the first core blocks file transfer, printing etc.

Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Yes, we have experienced the Exchange Search spike on many SBS 2011 systems. It does indeed bring the server down to a crawl.

ChristianWirthAuthor Commented:
As nothing helped we had  call with Microsoft.

The following hotfixes brought the solution without kowing which one was the proper fix. The Microsoft technician told us to use this:

A Windows Vista-based, Windows Server 2008-based, Windows 7-based or Windows Server 2008 R2-based computer that shares some files and some folders may not respond to file share requests

"0xC0000009A" error message when you try to install Windows 7 SP1 or Windows Server 2008 R2 SP1

0x0000007F" Stop error occurs when the connection to some shared files is lost on a computer that is running Windows Vista, Windows Server 2008, Windows 7 or Windows Server 2008 R2

You cannot access shared files or shared printers in Windows 7 or in Windows Server 2008 R2
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