[DRBD-user] Re: How to avoid split brain in primary/primary configuration

Rudolph Bott rb at megabit.net
Tue Mar 18 11:44:53 CET 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Florian Haas wrote:
> Grégory,
> On Monday 17 March 2008 17:04:46 Grégory Steulet wrote:
>> Hi Florian,
>> We are currently working on a DRBD presentation for a technical event. Now
>> I'm trying to deal with split brain problem in a primary/primary
>> configuration. I read your article about dopd, which is actually working

could you please provide the link to this article?

>> fine in a primary/secondary configuration. Unfortunately for the moment I
>> didn't find a way to avoid split-brain in primary/primary configuration
>> when the network connection between nodes is cut.
> I have suggested a possible solution for this here:
> http://lists.linbit.com/pipermail/drbd-user/2008-March/008883.html
> Unfortunately the original poster has not yet come back with any feedback on 
> this. I guess it's a good idea to be a little patient. :-)
>> I'm looking for an handler or anything which can make something like a "two
>> phase commit" (maybe a protocol D) ;-). I mean if the primary cannot write
>> on the other primary he either refuses to write or switch in  secondary
>> mode.
> This "either write to both nodes or none at all" is a concept that we refer to 
> as a write quorum, and this is a future DRBD feature listed on the internal 
> development roadmap. There is no release date for this yet, but it will be 
> included within this DRBD major release (i.e. before DRBD 9).
>> Second question, is-it possible to set up a resource to use two ethernet
>> interfaces (like in heartbeat ;-) ) ?
> No. But you can run DRBD over bonded network interfaces.
>> By the way... your blog was really helpful !
> Glad to hear that. :-)
> Cheers,
> Florian

Mit freundlichen Grüßen / with kind regards

Rudolph Bott
Megabit Informationstechnik GmbH
Karstr.25  41068 Moenchengladbach  Tel:02161/30898-0  Fax:-18
AG MG HRB 10141, GF: Dipl.-Ing. Thomas Tillig, Michael Benten

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