[Samba] Domain SID vs. Local SID on Domain Controller & SID requirements

[Miguel Medalha]

> IF a samba server is setup to be a domain controller, should
> it's local SID = the domain SID?
>
>   

The SID of the Primary Domain Controler (PDC) is also the Domain's SID.

> Also, what are the requirements of a SID?
>   

Security Identifier

http://en.wikipedia.org/wiki/Security_Identifier

> I usually see S-1-5-21-x-y-z, where x,y,z = 10 digits, but
> could x,y,z be 1,2,3 (for example)?   I.e. do they have to be
> 10 digit numbers or can they be shorter? 
>
> If I have a simple setup, and want a sid I can remember can I
> just make it 'short'?
>   

No. Please consult the above article.
You don't need to "remember" the SID, you may need to keep it.

net getdomainsid