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DM-AVAL

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Reply with quote  #1 
A clean "pristine" install is recommended and preferred my many, including myself.

We're looking at upgrading a number of domain controllers from Windows 2008 R2 SP1 (some standard, some enterprise) to Windows 2012 R2 standard.

There's a mix of virtual and physical.

For the virtual, we'll demote the old and install fresh vm's (then "dcpromo" - quotes because that's not what it's called anymore).

For the physical, there's a number of machines that are still good for the next 2-3 years and in-place upgrades are being considered. It's supported and just looking around the web (forums and so forth), some claim it works just fine. Some others encounter problems but whether that is due to problems intrinsic to the in-place upgrade process or user error is not clear.

So I thought I'd ask here - and in the Active Directory section because these are specifically domain controllers (ADDS and DNS roles).

There are some third-party apps (AV, backup) and I assume these should be uninstalled and reinstalled after the upgrade. Of course, we would ensure compatibility of these products with Windows 2012 R2.

So how many in-place upgrades of domain controllers have the forum members completed (roughly - I'm obviously not looking for exact statistics). How did it go?

Thanks!
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Pieter

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Reply with quote  #2 
All our DCs are virtual, so I always go for the scenario promote a new one and delete the old one. (In the past I have installed new DCs with the same name as the previous one, but that's not a good idea.)

Are your physical DCs in one site ? If so:
1. Demote one
2. Reinstall on the hardware and promote as DC
3. Repeat for the other DCs

Just a thought, why don't you install hyper-v on the hardware and create a virtual machine for the DC.

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Pieter Demeulemeester
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DM-AVAL

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Reply with quote  #3 
At one point in time, I think it was recommended to have a physical DC or two in case something happened to the virtual software. I'm not sure if those concerns are still valid (if they ever were) but for the moment, our policy is to retain a couple of physical DCs.

All the DCs are in the same AD site (but there are different physical sites).

A clean install on the same hardware has not been ruled out. We are simply taking a look at the in-place upgrade option.
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wobble_wobble

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Reply with quote  #4 
I've done everything: in place, replaced, renamed DC's (due to unknown dependences).

Personally I'd go for a new install.
I know Wes favours in place, but he also had issues with in place 2016 upgrade.

The requirement for a physical DC is probably replaced by having a DC in another location and I think Azue/ AWS/ vCloud offer if no other solution is available to have an off site DC.

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