[Samba] Migrate from one server (samba3) to a new one (samba4)

[Sonic]

On Thu, Jun 5, 2014 at 3:33 PM, Marc Muehlfeld <mmuehlfeld at samba.org> wrote:
> If you want to do the classicupgrade on a new host, then simply shutdown
> Samba on the old server and copy the databases listed in the Howto and
> your smb.conf + /etc/group to the new server. Migrating from tdbsam is
> quite simple. Nothing more should be needed.

Aren't the users and machine accounts in /etc/passwd also needed?

In a current environment I would like the AD to have a different
hostname so I can continue to run the old DC as a member server for
file/printer sharing. Can this be done? Is it fairly straightforward?

Thanks,

Chris