Hi Ralph,
First of all thanks for your help......... I read the above link and i thought this is for how to migrate the server. But still i am searching for answer of my question. I will explain you in detail for what i am looking, Recently we have added one new server in our project now i need to transfer all the source code from one server to another server and after that need to decommission old server. Please let me know how to proceed on this.
Thanks in Advance.....

The article above explains how to migrate your source code - with history - from one RTC Server to another one. This is the only way to do that. The only other way would be to load the repository workspace for a stream, unshare it and share it on another server, loosing the history.

If you wanted to keep all your data you would have had to migrate your server to another machine, keeping the public URI, or do a server rename.

Distributed SCM is also used in situations, where you basically want to share SCM data across multiple CCM applications e.g. to scale, but since it does a copy of all the changes (in the history of the stream) it is the best way to get SCM data from one machine to another as well.