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larbet
Contributor
Contributor

General Question about memory sizing and cpu sizing for VM's

I looked through alot of documentation on best practices for memory and cpu for ESX and guest VM's. Is there any documentation out there that specifically states how many VM's an ESX host can handle based on how many processors the host has?

I've been trying to explain this to my manager and he just looks at me all glazed over. If there is a document out there that specifically tells you how many VMs you can have per host that would be great. Or a tool I can run for sizing our environment.

They think it works just like a physical server and I am trying to build my case against not making everything in our environment a VM. Just because you can doesn't mean that you should and now I am running into VM sprawl.

Any help would be appreciated.

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esiebert7625
Immortal
Immortal

A general rule of thumb is 4 VM's per processor core, of course this will vary based on what is running on the VM's. You can get as much as 6-8 VM's per processor core on lightly used servers like webs servers and as few as 1-2 VM's per processor core on heavier used servers like SQL and Exchange. Check out these links...

ESX Workload Analysis: Lessons Learned - http://download3.vmware.com/vmworld/2006/adc9398.pdf

Getting the Right Fit: VMware ESX Workload Analysis - http://download3.vmware.com/vmworld/2005/sln056.pdf

Also see...

http://vmware-land.com/Vmware_Links.html#GettingStartedPlanning

Eric Siebert

VMware Communities User Moderator

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TomHowarth
Leadership
Leadership

As Eric says a good general rule of thumb for basic sizing is 4 vCPU guest VM's per physical processor core.

for a more through rough guide utilse the VMware Sizer on the HP site

"Bravery is being the only one who knows you're afraid." - David Hackworth

Kind Regards

Tom,

Tom Howarth VCP / VCAP / vExpert
VMware Communities User Moderator
Blog: http://www.planetvm.net
Contributing author on VMware vSphere and Virtual Infrastructure Security: Securing ESX and the Virtual Environment
Contributing author on VCP VMware Certified Professional on VSphere 4 Study Guide: Exam VCP-410
oreeh
Immortal
Immortal

Massimo has a nice article on his website: Virtualization hardware sizing (quick and dirty approach)

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larbet
Contributor
Contributor

Thank you so much for all of your answers I really appreciate it.

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