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Migration from AD 2003 to AD 2008 R2

Hi Experts,

We have an active directory setup of Windows server 2003(32 bit). One on them is PDC. Rest all are ADC. We have five locations worldwide and each of them holding one ADC.

PDC and each ADC are also DNS and DHCP for that location.

This is our objective: We need to upgrade PDC to Windows 2008 R2 and then all the ADCs to Windows 2008 R2 in two or three phases.

Here are my questions:

1. What are the steps that I need to take before starting this activities?
2. What do we need to take care while doing this activity?
3. What will be role back option just in case?
4. Our present PDC is running with only 2GB of RAM. I am proposing a 8 GB server for PDCs and ADCs since all of them will be holding the role of DNS as well as DHCP. Is my assumption is correct?

and finally, is there any step by step authentic procedure available so that I can follow it with out having any doubts?

Thanks in advanced....
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bubaibhatta
Asked:
bubaibhatta
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1 Solution
 
Nick RhodeIT DirectorCommented:
Here is a good link to browse through the steps:

http://blog.zwiegnet.com/windows-server/migrate-server-2003-to-2008r2-active-directory-and-fsmo-roles/

Basically its a walkthrough of the migration from 2003 to 2008 with screenshots to show the steps.  

Main thing is migrating the FSMO Roles to the new server your going to be setting up.  The transition is pretty simple and there will be a little bit of downtime involved.  I would give yourself a safety window of a couple hours.  DHCP and DNS is a matter of turning it off on one and turning it on another.

As for Hardware specs I guess it all depends on what else is the PDC and ADC's doing?  Are you using them as a print server or file server etc.  I typically have 4gb but then again it really depends on if your using them for more than just a DC
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bubaibhattaAuthor Commented:
Hi Nick,

Thanks for the quick reply. Our PDC and ADCs will be doing nothing other than DNS and DHCP jobs. So that means 8 GB is more than sufficient, I guess.

One thing I want clarify from you is that with following those steps does it also means that all User ids and Computer Ids and GPOs will be copied to new server?

I know it does, however just wanted to be absolutely clear.
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Nick RhodeIT DirectorCommented:
Yes, you are basically duplicating everything over (easiest way to migrate).
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