Solved

Memory Usage in VMware ESXi

Posted on 2008-06-14
2
4,855 Views
Last Modified: 2012-08-14
Ok Windows Server 2003 Standard in a 32-bit environment only uses 4GB of memory. If I have a server with 16GB of memory and ESXi installed on it then can I have 4 different Server 2003 VM each with 4GB? Like does ESXi recognize all of it and share it out correctly in a 32-bit environment?

I am new to virtualization and just trying to get a better understanding of it.

Thanks in advance for your help.
0
Comment
Question by:kserritt
2 Comments
 
LVL 18

Accepted Solution

by:
larstr earned 500 total points
ID: 21787782
If you install 4 servers you will be able to give each of them 4GB. Be however aware that Windows 2003 Standard can only see 3GB unless you boot with the PAE parameter. Also see here for more information:
http://support.microsoft.com/kb/283037/
http://support.microsoft.com/kb/291988/

Since you'll be using all memory you will be overcomimitting memory (ESX still needs some, and you also have some overhead per VM). But memory sharing will over some time help you out since you're running the same OS on all of your VMs.

A 4GB 1 vcpu 32 bit guest will have 136.5MB overhead. If you start all your VMs in a very short period you will because of this see both ballooning and swapping until enough memory pages between the virtual machines have been identified and shared. Because of this your virtual machines might run a bit slowly until this point.

For better understanding on how ESX is dealing with memory and resources please see:
http://www.vmware.com/pdf/usenix_resource_mgmt.pdf
http://www.vmware.com/pdf/vi3_35/esx_3/r35/vi3_35_25_resource_mgmt.pdf

Lars
vkktreeesxboot.jpg
0
 

Author Closing Comment

by:kserritt
ID: 31467306
Thank you very much for the information.
0

Featured Post

Zoho SalesIQ

Hassle-free live chat software re-imagined for business growth. 2 users, always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Exchange server is not supported in any cloud-hosted platform (other than Azure with Azure Premium Storage).
Will try to explain how to use the VMware feature TAGs in the VMs and create Veeam Backup Jobs using TAGs. Since this article is too long, I will create second article for the Veeam tasks.
Teach the user how to convert virtaul disk file formats and how to rename virtual machine files on datastores. Open vSphere Web Client: Review VM disk settings: Migrate VM to new datastore with a thick provisioned (lazy zeroed) disk format: Rename a…
This video shows you how easy it is to boot from ISO images for virtual machines with the ISO images stored on a local datastore on the ESXi host.

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now