[DRBD-user] How to know which node was the last primary ?

GAUTIER Hervé herve.gautier at thalesgroup.com
Tue Jan 6 14:18:52 CET 2009



Peter Sabaini a écrit :
> On Tuesday 06 January 2009 10:33:33 GAUTIER Hervé wrote:
>   
>> Unfortunately, I know well these states, but my question is in fact:
>> In case of split brain (and at any time), does DRBD know which member
>> still is or was primary ?
>> Or each peer does not keep any information concerning the other ? And it
>> will be to the clustering software to keep this information ?
>>     
>
> Hm, you probably can parse historical state data out of the kernel logfile; 
> otherwise I don't know if DRBD keeps past state data. 
>
> The other question is -- what are you going to do with this information? Have 
> you looked at configuring the split brain recovery policy? 
Well, it is to implement a cluster manager. It will be easier if DRBD 
could give me this information.
> Maybe it already 
> does what you want.  See http://www.drbd.org/users-guide-emb/s-configure-
> split-brain-behavior.html#s-automatic-split-brain-recovery-configuration
>   
Not exactly.
In fact, it is to refuse to start a DRBD service in case of split brain 
on a member which was not the last known (before split brain) running 
the service.
Maybe dpod is the solution, but I am not sure.

-- 
Hervé GAUTIER            herve.gautier([AT])thalesgroup.com
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