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You can't have two servers with same name on the network at the same time so you either have to re-configure app to talk to servers with different names or look at renaming servers.<br />
<br />
I would upgrade Active Directory first.<br />
<br />
Is all this physical servers? I also would look at using Virtualization to provide hardware resilience.
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Sorry. I think VM wont perform well for SQLDB in cluster mode.<br />
Will Domain and additional domain can be upgraded from 2003 R2 32 bit to 2008 R2 64 bit without formatting?
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1. Whilst an &nbsp;upgrade from 2003r2 to 2008r2 won't actually re-format the disk it doesn't preserve any applications or profiles. <br />
<br />
2. Sorry , certainly in Hyper-V SQLDB will perform well in cluster mode, but I wouldn't run it in cluster mode. I would use VMware HA to provide hardware resilience. In Hyper-V use HyperV clustering rather than SQL clustering. I can't comment on SQL performance in Hyper-V.
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We dropped the migration as of now
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<div class="content wysiwyg-content">
Team,<br />
&nbsp;Find the attached existing setup. Planning to migrate to OS 2008 R2 64 bit in all servers and SQL 2008 64 bit in Database Servers without disturbing day to day work. Please find the plan, <br />
<br />
Suggest.<br />
<a href="https://filedb.experts-exchange.com/incoming/2013/12_w52/824945/Current-Setup.jpg" target="_blank" class="file-inline" title="current setup (85 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Current-Setup.jpg</a><br />
<a href="https://filedb.experts-exchange.com/incoming/2013/12_w52/824946/Steps-and-suggestion.docx" target="_blank" class="file-inline" title="Steps (14 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Steps-and-suggestion.docx</a>
</div>
</div>


Current-Setup.jpg

Steps-and-suggestion.docx

Team,
 Find the attached existing setup. Planning to migrate to OS 2008 R2 64 bit in all servers and SQL 2008 64 bit in Database Servers without disturbing day to day work. Please find the plan, 

Suggest.

SERVER OS and DB Migration

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).