Urgent! MS Virtual Machine Server and DCs, need arguments against

Posted on 2005-04-11
Last Modified: 2010-04-18
Hi All,

Doing some contracting during a datacenter migration for a company and one of their plans is to move their 2 DCs off stand-alone servers to 2 instances running on Microsoft Virtual Server 2005.

I'm not a complete VMS expert but I do know that MS doesn't recommend this for a production environment. My gut says moving their DCs along with DNS and DHCP complately to VMS is a bad idea. My vote (even though I don't really have one since I just push the buttons) is to at least compromise and leave one DC physical.

I'm working along side their direct admins and most of them feel this is a bad idea as well but have been shot down repeatedly and told do it anyway. As you can guess morale is a problem at this point. There are no budget or space constraints. These folks has 300+ servers and they are getting back about 100 by rolling out VMS. For the life of me I can't figure out why they would be so against keeping a DC on it's own server.

I was able to get a meeting for tomorrow and could use some help with articulate arguments against putting EVERYTHING I mentioned to VMS.

Basically we are up against a senior admin who is "setting the new direction" and his word seems to be golden to management. As an "example" about his direction he also wants to DHCP the same VM DC's etc... He has no idea what he's doing.

Help! Thanks!
    LVL 15

    Accepted Solution

    >their plans is to move their 2 DCs off stand-alone servers to 2 instances running on Microsoft Virtual Server 2005.
    In my oppinion this is insanity! It will be trouble!

    But MS says:
    "Running Domain Controllers in Virtual Server 2005
    On servers running Windows Server 2003 and Virtual Server 2005, you can install multiple domain controllers in separate virtual machines. This platform is well suited for test environments. With strict adherence to requirements described in this paper, domain controller virtual machines can also be used in production."

    Check out that word document, and pay attention to section 9 : "Disadvantages of Deploying Domain Controllers in Virtual Machines", There is some issues there...
    LVL 7

    Expert Comment

    Virtual machines are a cool thing. I would distribute, distribute, distribute though.  One DC per physical box. You definitely don't want all your DC's on a single VM box in different instances when a CPU dies or a chip goes bad. Yes the servers will have redundancy but not for everything.

    Author Comment

    Had the meeting and presented great arguments backed up with data.  They are still moving forward with the VMS plan. I'm going to wrap up today and walk away. Thanks Mattisflones for the link to the MS doc.
    LVL 15

    Expert Comment

    Anytime, sorry i couldnt present the big-NO paper...

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