Virtual Domain Controller in Hyper-V 2012R2

I have always heard never virtualize your domain controller is this good practice or old school? I think it is ok to virtualize a DC in Server 2012R2 from what I have read but I am wanting to get some advice. Most of our customers are only 5-25 users with one server. I would like to use one host with 2 vm's one of them the DC and the other an app and file server. Is this a good practice?
c-coxAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
nothing wrong with virtualizing a domain controller
should always have at least 2 for redundancy and often times preferred having 1 virtual and 1 physical though if you have both virtual, never have both on the same host
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
The primary concern with virtualizing a DC has to do with domain time in our experience.

We set up our DCs to poll the host (Hyper-V) for time after setting up the host as a time server with the necessary port for NTP opened on the firewall. We do this so as to avoid time skew.

Our blog post: Preparing a high load VM for time Skew. Step 4 and on is relevant to 2012 R2.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
All our Domain Controllers and our clients have been virtual since 2004!

see here

http://blogs.technet.com/b/askds/archive/2010/06/10/how-to-virtualize-active-directory-domain-controllers-part-1.aspx

We just make sure we have good external time sources to sync the DCs to.
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c-coxAuthor Commented:
Thank you for your advise!
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