We help IT Professionals succeed at work.
Get Started

Best Practice Advice - Server 2K8 R1 High CPU Utilization on ESX 3.5 U4

1,259 Views
Last Modified: 2012-06-22
PROBLEM: High CPU utilization on VM guest OS.

My ESX 3.5 U4 hosts four production servers.  Three are 2003 R2 and one is 2008 R1.  The 2003 VMs run just great (and I mean GREAT), but the 2008 installation is really slow, in fact the task manager performance tab hangs out at around 40-50% with just core services (wmiprvse.exe, System, etc.).  It peaks to 100% frequently with even the slightest activity.  The 2008 VM has one virtual processor.  Everything here is 32 bit.  

The 2008 VM functions as a DFS file server and backup domain controller only.  This was the only VM that was not P2V'd.

Hardware environment is a ML570 G2 quad Xeon 2.8 with 12GB RAM.  Yea it's old, but it works great and should be plenty fast enough for the workload.

I can see in vCenter that the guest performance peaks at about 2,800MHz of CPU.  There is plenty of host processor resources available when I look at the ‘Performance’ tab of the host.  Also, there is sufficient RAM available.

Is something configured incorrectly?  Is the amount of CPU available to the guest somehow limited by the clock speed of the host CPUs?  I know that sounds like a n00b question, but I’m really confused here.  Should really just migrate the 2008 VM to a faster host?  Should I utilize virtual SMP?
Comment
Watch Question
Top Expert 2015
Commented:
This problem has been solved!
Unlock 1 Answer and 5 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE