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....