Friday, April 23, 2010

What is Hyper virtualization?

Hyper-V is Microsoft's answer to VMware ESX and other hypervisor based virtualization solutions. For those who are virtualizing Windows servers, Hyper-V presents a compelling Windows virtualization solution based on much lower cost and a feature set that's good enough for many Windows based IT shops.
Those who remember Microsoft Virtual Server should know that Hyper-V is a complete rewrite and is a different piece of software. Microsoft Virtual Server is a host based virtualization solution, which is too slow for a production enterprise environment. On the other hand, Hyper-V is a hypervisor based virtualization solution that's very well suited for high performance production environments.

Hyper-V CPU and I/O Performance

Hyper-V requires hardware assisted virtualization such as Intel VT-X or AMD-V which makes virtualization run fast. The consequence of requiring CPU based virtualization assistance also means Hyper-V will not run on old hardware and that it will only work on 64-bit Windows Server 2008.
I/O performance was independently tested by storage vendor Qlogic with results that show Hyper-V performed at 88% to 99% of native performance, depending on the storage subsystem used.

Hyper-V Quick Migration

With Hyper-V's Quick Migration, a virtual machine is suspended while it's being copied over the network to another physical server. The duration a virtual machine is down is short, but there is still downtime.

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