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When selecting you hardware, there are many factors to consider; How many Virtual Machines do you want to run at a time? How busy will these Virtual Machines be? If you are getting ready to P2V a bunch of virtual machines, then you should use Perfmon (In a Windows Environment) to take a benchmark before proceeding.
In this article, I am not going to focus on sizing your environment, but rather making sure that the hardware you select is going to be compatible with what you want to do.
The first thing you need to consider is whether you are going to go with AMD or Intel processors. There are other brands out there, but I can’t say how well VMWare supports them. Both AMD and Intel support something called Hardware Virtualization. AMD calls their implementation “AMD-V” and Intel calls their implementation “Intel VT”. This hardware virtualization is not a deal breaker depending on what you want to do, but if you plan to run any 64 Bit virtual machines it is a requirement. Some virtualization packages won’t install if your system does not support Hardware Virtualzation.
If you already own the hardware you want to use as your Virtual Machine Host, there is a tool you can use to check the compatibility called Securable. Securable can be run in a windows environment, or in a Linux environment via Wine. It is a very basic tool which tells you what your system supports.
If you don’t already own the hardware you plan to use for virtualization, there are some resources available to you to help you decide what to buy. According to a representative at AMD:
“With the exceptions of Sempron-branded processors and Turion K8 Rev E processors, all notebook processors shipped by AMD include AMD-V and therefore support Windows 7 XP mode."
"With the exceptions of Sempron-branded processors and pre-Rev F Athlon branded processors, all of the desktop processors shipped by AMD include AMD-V and therefore support Windows 7 in XP mode."
"Also, all AMD Opteron processors shipped by AMD from Rev F forward include AMD-V.”
The above Quote was found at CNet
In case the above statement does not make sense, you can go to the AMD-V Processor list and see if the CPU you are considering is listed. Intel has a similar Processor List. Click on each processor and see if it says that the Intel VT-x is supported.
The above quote mentions Windows 7 XP Mode support. When Microsoft first released their new version of virtual PC, also known as XP Mode, they required Hardware virtualization support. Microsoft has since released a patch removing this requirement. Unfortunately, you still cannot run 64bit virtual machines without the Hardware Virtualization support.
So far we have covered whether or not the processor supports hardware virtualization. The motherboard has to also support hardware virtualization. Unfortunately the motherboard manufacturers don’t seem to make it really easy to determine whether or not their motherboard supports Hardware Virtualization. You can check the box or description and see if it lists AMD-V or VT-x, which they may or may not list.
Intel has a fairly new technology called vPro. one of the components of vPro is VT-x. If you go with an Intel chip, check for the vPro logo on the motherboard you purchase. If it lists vPro, then it will support Hardware virtualization. To see which Chip-sets support vPro, you can refer to the Chipset List on Intel’s Website.
I have not been able to find a great source as to what specific chipsets support the AMD-V feature, however, most motherboards with an AM2 socket and newer will support the AMD-V technology. If your current motherboard does not have an AMD-V option in the Bios, and you have a AM2 socket or newer motherboard, check your motherboard manufacturers website and see if there is an update to the bios. If there is not an update, try calling their technical support, in some cases they will have an update that is not yet published which will support AMD-V.
In my experience you want to avoid PATA (IDE) disk controllers when setting up your virtualization platform. ESXi does not support IDE Disks at all. So far, every SATA and SCSI controller I have tried under ESXi has worked. However, it would be best to check the hardware compatibility list for the specific controller you are looking to use. If you are going with a virtualization setup such as VMWare server, Hyper-V, or KVM you will just need to ensure your controller is supported under the operating system you are running the platform on. Example: Hyper-V runs on Windows Server 2008, KVM will run on some flavor of Linux such as Red Hat or Fedora, and VMWare server can run on Linux or Windows.
I have linked to the Hardware Compatibility list (HCL) for a few of the platforms you may be interested in. Keep in mind that just because something is not on the HCL, does not mean it will not work. It just means that VMWare, Citrix, etc... have not tested it. When using virtualization software on desktop class systems you will have a harder time than if you are buying server class machines.
Minimum Requirements: http://www.microsoft.com/hyper-v-server/en/us/2008-system-requirements.aspx
Citrix Xen Server