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Windows Server 2012 -- how much space and single vs multi-servers?

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Last Modified: 2016-09-14
I'm fairly tech savvy, but am very new to the server environment.  I have an HP ML110 with WS 2012 R2 installed.  I have 3 TB HDDs, with two of them in a RAID 1 (the third is just hooked up but no recognized because it hasn't been added to an array.)  I'm not married to this configuration, it's just the way I did it when I started.

My end goal is to have a home server that runs AD DS, DNS and DHCP and also acts as a file server.  I don't have any processor-intensive applications (SQL db, etc).

I wanted to know what is best practice regarding:

1. RAID configuration.  Is it just best to take all my physical disks and create 1 large array?  
2. 1.5TB at RAID 1 or 3TB at RAID 0?
3. Is it ok (for performance purposes) to have AD DS, DNS and DHCP on the same server?
4. Should I use Hyper-V and create multiple virtual servers to run the above services?

If there are any other broad rules of thumb that I should be aware of please let me know.

Thank you
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