[DRBD-user] examples of dual primary DRBD

Bart Coninckx bart.coninckx at telenet.be
Sat Oct 8 15:55:42 CEST 2011


On 10/08/11 00:25, Lars Ellenberg wrote:
> On Fri, Oct 07, 2011 at 10:21:08PM +0200, Bart Coninckx wrote:
>> On 10/06/11 22:03, Florian Haas wrote:
>>> On 2011-10-06 21:43, Bart Coninckx wrote:
>>>> Hi all,
>>>>
>>>> would you mind sending me examples of your crm config for a dual primary
>>>> DRBD resource?
>>>>
>>>> I used the one on
>>>>
>>>> http://www.drbd.org/users-guide/s-ocfs2-pacemaker.html
>>>>
>>>> and on
>>>>
>>>> http://www.clusterlabs.org/wiki/Dual_Primary_DRBD_%2B_OCFS2
>>>>
>>>> and they both result into split brain, except for when I start drbd
>>>> manually first.
>>>
>>> They clearly should not. Rather than soliciting other people's
>>> configurations and then try to adapt yours based on that, why don't you
>>> upload _your_ CIB (not just a "crm configure dump", but a full "cibadmin
>>> -Q") and your DRBD configuration to your pastebin/pastie/fpaste and let
>>> people tell you where your problem is?
>>
>> OK, I posted the drbd.conf on http://pastebin.com/SQe9YxhY
>>
>> cibadmin -Q is on http://pastebin.com/gTZqsACq
>>
>> The split brain logging is on http://pastebin.com/7unKKkdi .
>
> I somehow think you added some "--force" or "--overwrite-data-of-peer"
> to some drbdadm/drbdsetup primary invocation?
>
>> Could this be some sort of timing issue? Manually things are find,
>> but there are some seconds in between the primary promotions.
>

OK, seems to be some sort of timing issue. I "fixed" this by adding a 
"sleep 1" in the RA right before the "do_drbdadm primary $DRBD_RESOURCE" 
line.

I'm surprised though that I'm the first one to run into this.

B.




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