[Samba] Acronyms: what is PDC and BDC?

L.P.H. van Belle belle at bazuin.nl
Tue Mar 4 02:14:02 MST 2014

Forget PDC of BDC , ( not if you using samba 3, there it exists) 

samba 3, then we talk in PDC/BDC style ( think in master - slave ) 
samba 4, the we talk in AD-DC style ( think multi master ) ( and slave maybe bit as in RO ADDC ) 
and this is why we always must tell which samba we are working with..  ;-) 

>Yes, good. First; primary, hence PDC?  No, still AD-DC  
>AD doesn't have a PDC. half correct it has a PDC-emulator ;-) 

as the wiki says..

The "PDC emulator" master acts in place of the "Primary Domain Controller" 

=> !! if there are Windows NT 4.0 domain controllers (BDCs) remaining within the domain  !! <= 

correct me if i'm wrong.. 



>-----Oorspronkelijk bericht-----
>Van: steve at steve-ss.com [mailto:samba-bounces at lists.samba.org] 
>Namens steve
>Verzonden: maandag 3 maart 2014 18:21
>Aan: samba at lists.samba.org
>Onderwerp: Re: [Samba] Acronyms: what is PDC and BDC?
>On Mon, 2014-03-03 at 17:47 +0100, Marc Muehlfeld wrote:
>> Hello,
>> Am 03.03.2014 12:55, schrieb L.P.H. van Belle:
>> > PDC = Primary Domain Controller
>> > BDC = Backup Domain Controller
>> The AD DC are all the same and replicating their directory 
>content to 
>> each other (multi-master configuration).
>> Sometimes here on the list, some people say "PDC", but 
>talking about an 
>> AD DC.
>So it's interpretation based: PDC on this list may or not mean AD?
>> > the First DC had all FSMO roles.

>Yes, good. First; primary, hence PDC?  No, still AD-DC 

>> But of course you can transfer a single up to all roles to 
>other DCs if 
>> you have more than one.
>So the latter then become the PDC? But no. That can't be. AD doesn't
>have a PDC.
>I think I've got it. It's just a real pita to have to look at the
>context each time, especially when you then have to translate and
>For us, it should be easy since we've only ever had AD DC's, so I'm
>gonna go for, 'We have neither PDC nor BDC'. Of course, that's 
>not gonna
>help when reading the list.
>Cheers and many thanks for the help,
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