Update: 26th June 2008. Hyper-V RTM is now available. This post refers to pre-release software for Hyper-V, formerly known as Windows Server virtualization. However, there is no difference in the guidance provided in this post.
Following on from my post last week, I had some good questions asking about the difference between the SCSI adapter in Virtual Server and the SCSI controller in Windows Server virtualization. In Virtual Server 2005, the best practice is to configure Virtual Machines to boot from the SCSI adapter for performance reasons. This is not the case in Windows Server virtualization. This post takes a dip into explaining why. To start with, let’s take a look at the SCSI adapter in Virtual Server
So keeping that in mind, let’s compare and contrast the above with the IDE and SCSI controllers in Windows Server virtualization.
Hopefully that gives a bit more insight into why the best practice recommendation of booting from SCSI in Virtual Server no longer applies in Windows Server virtualization and why booting from IDE does not incur the same performance overhead as in Virtual Server. Cheers, John.