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Strange Issues with Hyper V

Posted on 2009-07-07
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Last Modified: 2013-11-11
To start, let me tell you our setup:

1.) Physical Server - DC - Windows Server 2008 Standard SP1 running Hyper V and only one virtual machine.
       - Hyper V is configured to use the same NIC as the physical box.
       - 8GB of RAM in the physical machine, 4GB allocated to virtual machine
       - 2 Dual Core Xeon 2.66Ghz 64bit
 
2.) Virtual Server - Exchange  - Windows Server 2003 Standard
       - Using same NIC as the physical machine
       - Exchange 2003 Standard
       - Brightmail
       - Configured to use up to 100% of all the CPU's

There are two issues that I believe are related:

1.) From the VM, when I ping itself, or anything else, I can get normal ping times but typically I can get >10,000ms ping times. The odd part is, when I get super high pings, the results appear instantly instead of taking a super long time like it should.

2.) The hard drive write queue is averaging 42 and maxing out at 402 using performance monitor. This is only happening on the VM and not on the physical machine.

Memory, hard drive, NIC and CPU usage are all at low levels and doesn't appear to be an issue.

Let me know what you guys think?
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Question by:iVenture_Solutions
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Expert Comment

by:plimpias
ID: 24810134
on all windows 2003 machine. Edit the Boot.ini file and and the end add /usepmtimer . Restart your servers and your ping time legancy will go away =)
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Expert Comment

by:plimpias
ID: 24810147
the comment before goes for all VM's. what RAID setup do you have on the host? Hyper-V has intensive read writs on the hard drives. What i would recommend doing is converting your Vm's to Fixed disk. This should resolve a lot of your IO read and write performance problems.
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Accepted Solution

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plimpias earned 500 total points
ID: 24810177
Also install windows 2008 SP2. afte you install this you need to install the integration tools again. Lots of enhancments in the new version of Hyper-V. =)
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Expert Comment

by:martin_bravo
ID: 24872916
Hi,
Do you have any AV solution installed? If yes, have you excluded the processes and file extensions correctly?

I've similar issues with Windows 2008 R2 (RC 0) and TrendMicro AV, after remove the AV, my problems were solved.

Regards and good luck!
Martín.
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Author Comment

by:iVenture_Solutions
ID: 24929470
Plimpias, thanks for your replies. I will be trying these things on our client machines.

They are running RAID 5 on the machine having the issue.

Martin - they are running SAV, but we have removed it from the machines that are having the problems.

-Lee
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Expert Comment

by:plimpias
ID: 24929631
Ok great keep us posted thanks,
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