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Windows Server 2008 R2 Thread, VHD's vs Physical Disks in Technical; Hi All, Was just wondering whether you guys had noticed a difference in performance between Virtual Disks and Physical Disks ...
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    wroberts's Avatar
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    VHD's vs Physical Disks

    Hi All,

    Was just wondering whether you guys had noticed a difference in performance between Virtual Disks and Physical Disks

    I know VHD's have there obvious advantages (Felxibility, Expandablility) but do you lose Read Write speed on a Virtual disk or not ?

    Any help or advice would be greatly appreciated

    Regards

    Will

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    Quote Originally Posted by wroberts View Post
    Was just wondering whether you guys had noticed a difference in performance between Virtual Disks and Physical Disks
    I've set up our main file server with a disk array passed through directly as a device available to the VM rather than putting a disk image on the disk array and having the VM system pass a virtual harddrive to the VM. I doubt there is much performance overhead really, and seemingly VHD provides rather better snapshot performance than Linux's LVM does.

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    The performance difference between a fixed VHDX and a pass-through disk is negligible really (2-4%).

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    Here is a the whitepaper released on this subject for server 2k08, I have not looked but I guess they have redone the tests with 2k12.
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