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building a cheap virtual host for 3 windows server VM guests

I'm trying to build a cheap virtual host machine with desktop components.
I will buy AMD 8 core cpu and 32gb ram and Gigabyte GA-990FXA-UD3 motherboard. Then it will host 1 windows 8 server for testing and 2 windows 2003 server converted from physical servers which used to be our file/application servers, but we retired, we only keep them as reference purpose.

So, now I have to decide what virtualization I use.
ESXi
virtualbox on windows 7/8
hyper-v on windows 8
vmware workstation

If I run server OSs on top of windows 7/8, how the number of concurrent connections more than 10(?I think it was 10...) are handled? Will it block at the host level or VM is transparent no matter what OS is hosting the VM?

I also have Windows 2012 server running one VM server. If I want to use this desktop level server as live migration for failover, will it work if I use hyper-v with Windows 8?

What's benefit of ESXi using instead of hyper-v windows 8 or MS hypervisor?

I have used virtualbox and vmware workstation, but these two seem to be out of my choices than hyper-v windows 8 or ESXi....

Besides, what is your backup strategy of your virtual machines other than snapshots?

Any comment, welcomed.
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Avatar of Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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One of questions was, if I run server on top of windows 8, then how the limit of 10 concurrent users is counted.

20 users access windows 2003/2008 servers running on any vm hosted in Windows 8, then does windows 8 blocks 11th user or since vm is server os, it will allow access?

Also, let's say one of windows 2012 server virtual machine hosted as Hyper-v guest in another windows 2012 needs to be moved to this Windows 8 computer for maintenance or failure, whatever reason. Will Windows 8 can take this hyper-v guest shipped out from Windows 2012 server? Compatibility issue.

I have used virtuablbox and vmware workstation, SSD with 4 testing servers run wonderful. But if hyper-v guest can be moved without compatibility issue between two hosts, Windows 8 and Windows 2012, I probably go with Hyper-v
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lol
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In case if I want to move hyper-v guest on windows 2012 to windows 8 for maintenance or any reason, can I do that manually, maybe shutting off the guest and move the vhdx file to windows 8, will there be compatibility issue? Just to run temporarily
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Thanks, Hanccocka and Insidertech. I was also looking at, it seems that is how it's made. Wow, I'm excited.

http://social.technet.microsoft.com/Forums/windowsserver/en-US/697d61fa-e5ca-497d-bd5b-eafd5ae5a6f4/importing-hyperv-vm-to-windows-81-hyperv-from-windows-server-2008-r2-hyperv-export-gives-error?forum=winserverhyperv

I'm going to ebay and newegg to order.

Happy New Year!!!