drbd-user March 2010 archive
Main Archive Page > Month Archives  > drbd-user archives
drbd-user: Re: [DRBD-user] dual primary mode with which FS

Re: [DRBD-user] dual primary mode with which FS

From: Michael Schwartzkopff <misch_at_nospam>
Date: Tue Mar 23 2010 - 18:35:28 GMT
To: drbd-user@lists.linbit.com

Am Dienstag, 23. März 2010 17:08:56 schrieb Digimer:
> On 10-03-23 10:02 AM, Florian Haas wrote:
> > On 2010-03-23 14:52, Michael Schwartzkopff wrote:
> >> Am Freitag, 19. März 2010 14:12:30 schrieb Andreas.Ruetten@hansenet.com:
> >>> Hi list,
> >>>
> >>> first of all please answer also to my email-address because I'm not
> >>> subscribed to the ML.
> >>>
> >>> Here are my questions:
> >>>
> >>> I have to set up drbd 8.0.14 (Debian stable) in dual-primary mode.
> >>> One node has to read and write while the other node only need read
> >>> access.
> >>>
> >>> Do I need GFS or OCFS?
> >>
> >> Not really if you can be sure that the second node ONLY reads.
> >
> > Are you nuts? I thought you wrote books about this!
> >
> >>> Or would a simple etx3 sufficient enough?
> >>
> >> Yes. Mount option "read-only" in the second node.
> >
> > I repeat my above statement.
> >
> > I'm totally baffled right now.
> >
> > Andreas: you want to put a filesystem on dual-Primary DRBD, it has to be
> > a cluster filesystem. No ifs, buts, or maybes.
> >
> > Question is, do you really need dual-Primary DRBD? You most probably
> > don't.
> >
> > Florian
>
> From a purely technical view point, Michael isn't wrong. If the second
> node never changes a single block on the DRBD partition, it can't
> technically hurt it. Of course, you'd need to make sure that the node's
> DRBD doesn't try to recover from failures without first fencing the
> other node.
>
> It's not wise, but it's not impossible, either.

didn't have my best day today. Although it should be possbile I did not say it
is wise to do.

Greetings,
-- Dr. Michael Schwartzkopff MultiNET Services GmbH Addresse: Bretonischer Ring 7; 85630 Grasbrunn; Germany Tel: +49 - 89 - 45 69 11 0 Fax: +49 - 89 - 45 69 11 21 mob: +49 - 174 - 343 28 75 mail: misch@multinet.de web: www.multinet.de Sitz der Gesellschaft: 85630 Grasbrunn Registergericht: Amtsgericht München HRB 114375 Geschäftsführer: Günter Jurgeneit, Hubert Martens --- PGP Fingerprint: F919 3919 FF12 ED5A 2801 DEA6 AA77 57A4 EDD8 979B Skype: misch42 _______________________________________________ drbd-user mailing list drbd-user@lists.linbit.com http://lists.linbit.com/mailman/listinfo/drbd-user