[Samba] samba3 and samba4 in the same domain?

[Jeremy Allison]

On Tue, May 11, 2010 at 11:08:44AM +1000, Andrew Bartlett wrote:
> On Mon, 2010-05-10 at 14:40 +0200, Tomasz Chmielewski wrote:
> > I have a Samba3 + OpenLDAP installation.
> > 
> > How can I make Samba4 running on a different server be in the same 
> > domain, have the same users etc.?
> 
> I presume you mean mixing both Samba3 and Samba4 domain controllers in
> one domain?  This is not possible.  Any upgrade to samba4 would prevent
> you running a Samba3 DC.  We don't support 'mixed mode' like that.
> 
> We also don't support hosting Samba4 on a 'unix like' LDAP server
> layout.  The schema is the AD schema.  (FreeIPA is trying to create a
> setup with a unix-like schema, but you will have to ask them about their
> progress). 
> 
> We also don't yet have good upgrade scripts from Samba3.  It can be
> done, but a lot of the task will be manual. 

I have some ideas on that Andrew (upgrading an existing S3 domain
to S4). I'll try and call and chat tomorrow to see if my ideas are worth
discussing further on the list.

Jeremy.