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

[Felipe Gutierrez]

Hi Soni,

I did these configurations on my DRBD and the correct recovery of
split-brain worked well.
http://www.drbd.org/users-guide-8.3/s-configure-split-brain-behavior.html#s-split-brain-notification

I believe that the article you sent to me is about split-brain on Corosync
and it is different of split-brain of DRBD. I didn't understand well why
yet.

But at least, my system worked :)

Thanks!
Felipe

On Wed, Dec 19, 2012 at 2:34 PM, Felipe Gutierrez <
felipe.o.gutierrez at gmail.com> wrote:

> 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 is because DRBD on younger Primary is Standalone and Outdated.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*
>



-- 
*--
-- Felipe Oliveira Gutierrez
-- Felipe.o.Gutierrez at gmail.com
-- https://sites.google.com/site/lipe82/Home/diaadia*
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