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How do I resolve a Microsoft Exchange Server having irregular email delays?

Our Microsoft Exchange server Std 2010 has operated with no issues up until recently. Delays occur any time during the day but mostly between 10:00 and 14:00. A day or two may go by where the system is fine though. CPU Utilization normally increases to 100% when delays occur and the NT Kernel System service runs very high.

The server runs as a virtual domain controller and an Exchange Server using Windows 2008 R2 and works together with another SMTP virtual server having GFI Mailessentials 2014 (latest build). Both servers run on Vmware 5.1 and have what we believe to be sufficient resources. There are approximately 250 mail users. A third server runs GFI Mailarchiver that interfaces with the active directory.

Servers have the latest Windows patch releases and Exchange SP3.

There is no antivirus applications running on the servers.
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NoAdmin
Asked:
NoAdmin
1 Solution
 
Simon Butler (Sembee)ConsultantCommented:
Exchange isn't normally CPU heavy.
When the CPU goes to 100%, what is actually using it?

Simon.
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Will SzymkowskiSenior Solution ArchitectCommented:
Do you only see this behaviour during a specific time of day? Check the processes tab and see what is loading at the time. Do you have anti-virus on this server with a specific scanning schedule or backups running on this machine during a period of time?

Will.
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dalbersonCommented:
Be sure that you AntiVirus software is configured to EXCLUDE scanning the email databases...this will definitely cause performance problems if not configured correctly.

Some AntiVirus programs sometimes "forget" even if you have exclusions configured, and start scanning directories and files they shouldn't anyway. In that case, uninstall and reinstall the AV program.
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NoAdminAuthor Commented:
We have increased the cores on each of the vCPUs and after 5 days have not experienced the problem again so we believe the issue to be resolved.

Many thanks to all for your time and comments.
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NoAdminAuthor Commented:
Problem was resolved
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