Windows not matching Virtual Center

GWitek
GWitek used Ask the Experts™
on
Clean install of Server 2008
Resource Monitor is not matching the performance tab of Virtual center (see attachments).

Running ESX 3.5 update 4
 resourcemont
 VC
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May I know what report of VC is attached in the second screen-shot ?

Author

Commented:
The default "Memory" report
I would like to confirm whether you had monitored the RAM Usage in Windows VM over a period of time.
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Author

Commented:
Yes this has been happening for 2 or 3 weeks since the creation of the VM.
The only way of comparing both of them would be to monitor the Memory Report of vCenter with perfmon built-in within Windows running both of them for a fixed time period which would ease comparison.

Author

Commented:
Can you help me get started with Perfmon on a Windows Server 2008 server?
Is Perfmon built into server 2008?

Author

Commented:
Here are the screen shots from this morning.  Windows shows the VM as perfectly quite, VC shows it using around 75% the whole time.

We get constant alerts from Virtual Center when the Memory gets this high and it's getting really irritating.
VC.JPG
PerfMonMemory.JPG
Is the VM set with any Reservations or Limits as ?

Author

Commented:
Not sure what you mean by reservations or limits.
I've set the VM to have 4Gb of memory.

Author

Commented:
Please see attached screenshot.
What is this about? I've set my VM to have 4Gb of memory on the Hardware tab, but on the Resource tab it looks like it's set to unlimited...?


Memory.JPG
Setting the VM with 4GB of memory does not limit it only to 4GB, which is why the Unlimited option is checked.
If the VM has a genuine requirement for 6GB of RAM, then the VMKernel would provide the same.

Author

Commented:
So what is my best practice here?
Should I leave it at unlimted or limit it? Will it have any effect on my problem? Is this what you were refering to with Limits and Reservations?
Limits and Reservations would be helpful when you want critical VMs to be up and running all the time and prioritize based on the requirements.
I would suggest leaving the setting to Unlimited.
Unless you have a genuine requirement and understand the pros and cons of Limits and Reservatoins, I would recommend not meddling with them.

Author

Commented:
I will leave them alone then.

Any idea on the memory usage snap shots from above?


GWitek - I am unable to address this particular concern, I apologize.
Commented:
ESX Update 5 fixed this problem.

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