by Jacob Laue Petersen
8. June 2010 12:41
Today I came across this somewhat “classic” error when deploying a new Hyper-V server. When firing up a VM you receive this error message: An error occurred while attempting to start the selected virtual machine(s). In details it says that the hypervisor is not running.
When receiving this error please make sure that…
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Hyper-V server has been powered down and up after adding the Hyper-V role. A simple restart won't be enough.
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Bios settings is correct. This is a sample from an IBM 3650 (Intel proc). Enable “Execute Disable Bit” and enable “Intel Virtualization Technology".
A sample from AMD based proc will follow

More...
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Hyper-V
by Jacob Laue Petersen
3. June 2010 00:53
Microsoft has released a white paper which compares the different disk type to use in Hyper-V R1 and R2. It covers dynamic VHD disks, fixed size VHD disks and raw devices, and measures performance on different kind of server workloads.
A very interesting white paper – happy reading
http://download.microsoft.com/download/0/7/7/0778C0BB-5281-4390-92CD-EC138A18F2F9/WS08_R2_VHD_Performance_WhitePaper.docx
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Hyper-V