Can you still have more virtual environments on one machine with VMWare than Hyper-V?

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Microsoft Virtualization Chat 7/30
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one of the things I have read is the fact you can still have more virtual environments on one machine with VMWare than hyper V This question is from the 7/30 Microsoft Virtualization Chat on ITKnowledgeExchange.com

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I believe with the R1 versions of Hyper-V this was more true, but with Windows Server 2008 R2 Hyper-V and Systems Center Virtual Machine Manager 2008 R2, there are features that remove this obstacle. First of all, with Live Migration in Hyper-V, I can now migrate my VMs from one machine to another as workloads change. This can by dynamic with the PRO Tips within VMM 2008 R2. This means that I can run my machines to higher utilizations and get the most out of the boxes. We don’t have memory overcommit, like ESX Server, but for most customers, we can still run a tremendous amount of VMs. ::

Memory overcommit is mentioned in passing, but its a rather important distinction. Check out this blog:

http://blogs.sepago.de/helge/2008/09/25/vmware-vs-microsoft-why-memory-overcommitment-is-useful-in-production-and-why-microsoft-denies-it/

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  • beb4vm
    The Memory Overcommitment feature of VMware is the key here. This allow one to increase consolidation ratios on hardware because you don't have to allocate memory 1-to-1 with Physical RAM. For example, if I setup a Hyper-V host with 32GB of RAM and I know each of my Virtual Machines will have 4 GB of RAM assigned to them, the most VMs you can have on that host is 8. Doesn't matter if your VM is only using 5% of the of that RAM while it is running, or maybe it is only going to use 5% of the physical CPU. ESX can return unused memory to other VMs that are calling for it or hold it until any VM calls for it. ESX with Vmotion can provide all the same functionality as mentioned by Edwin and has been doing that since 2006. In addition, if you add Dynamic Resource Scheduling (DRS), you can have VMs migrate automatically on demand as workloads change thus allow a balance of resources across your environment.
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