[Pacemaker] Split-brain on DRBD + Corosync/Pacemaker

[Felipe Gutierrez]

Hi Soni, thanks for reply,

I understood that is not possible if I don't have a connection back-to-back
(dedicated).
But I am thinking to create a script that do that for me.
The commands are describe here:
http://www.hastexo.com/resources/hints-and-kinks/solve-drbd-split-brain-4-steps
And these commands will do the role of an administrator network.

Do you think is possible?

Thanks
Felipe

On Wed, Dec 19, 2012 at 9:41 AM, Soni Maula Harriz <
soni.harriz at sangkuriang.co.id> wrote:

> cutting the communication link between the two nodes is not a valid
> failover scenario. both side will think that other nodes offline and become
> primary. and if you reconnect them, the splitbrain will happen. you can
> make the communication link redundant between the two nodes. maybe these
> articles can help :
>
> http://www.hastexo.com/blogs/martin/2012/07/11/failover-testing-some-technical-background
> http://www.drbd.org/users-guide-8.3/s-prepare-network.html
>
> On Wed, Dec 19, 2012 at 6:21 PM, Felipe Gutierrez <
> felipe.o.gutierrez at gmail.com> wrote:
>
>> Hi everyone,
>>
>> I have a scenario that I disconnect my primary from the network and the
>> secondary assume, becaming primary. After this, I connect the younger
>> primary, and both nodes became secondary(DRBD), or Slave on Pacemaker. It
>> is because DRBD on younger Primary is Standalone and Outdated. It is a
>> split-brain scenario.
>> How do I make to my Pacemaker take care of that?
>> I read these
>> http://www.drbd.org/users-guide-8.3/s-split-brain-notification-and-recovery.html,
>> http://www.drbd.org/users-guide-8.3/s-configure-split-brain-behavior.html#s-automatic-split-brain-recovery-configurationand I think I cannot configure only my DRBD resource. I believe I need to
>> do something on my Pacemaker.
>> I think Stonith is not a good idea too, because I can reconnect my
>> younger primary machine.
>>
>> Thanks in advance,
>> Felipe
>> --
>> *--
>> -- Felipe Oliveira Gutierrez
>> -- Felipe.o.Gutierrez at gmail.com
>> -- https://sites.google.com/site/lipe82/Home/diaadia*
>>
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-- 
*--
-- Felipe Oliveira Gutierrez
-- Felipe.o.Gutierrez at gmail.com
-- https://sites.google.com/site/lipe82/Home/diaadia*
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