[Samba] Dead DC change?

Marc Muehlfeld mmuehlfeld at samba.org
Thu Oct 30 16:15:07 MDT 2014

Hello Ryan,

Am 30.10.2014 um 20:18 schrieb Ryan Ashley:
> It finally happened, a DC is down and I am trying to figure out what to
> do now. The LSI RAID card is dead (it actually caught fire briefly) and
> I obviously cannot boot the system until the replacement arrives. I do
> have a second Samba DC on the domain, but what I am seeing is that it
> runs like Server 2000 for some reason.

We're talking about an Samba AD DC?

What do you mean with "... runs like Server 2000"?

> It is acting like a backup DC,
> not a normal DC like 2008 and 2003. I know that in the Windows world all
> DCs have the global catalog and if one dies, no big deal. Now I am
> experiencing insanely long startup times on workstations and long logon
> times, as well as a few DNS issues.

If you're having multiple AD DCs, then if one goes down, the other
should work normal and users should not have any timeouts, etc. if there
is at least one DC up in the same AD site.

Maybe your second DC has/could not add it's entries into the DNS, so the
clients can't find him for logons, etc.

Try running
# samba_dnsupdate --verbose

It it fails, have a look here:
It describes some things to check/repair.

Do backups before!

> So, is this the old "PDC/BDC" setup? If so, how can I get past 2000 and
> make my domains a normal one after the other server comes back up? In
> the meantime, how can I get my domain running until the other server
> comes back up?

No. AD isn't master/slave like in the NT4 times (PDC/BDC). All DC are
equal, byside the FSMO roles. If one goes down, then the others are
doing it's job (byside the FSMO roles functions - see

And when your broken DC comes back, the replication bring all changes to
this host. If just the Raid-Controller is broken and you can replace it
without any data loss, this should be the way it will happen.


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