[DRBD-user] 3-Node DRBD Without Stacking

Dan Frincu dfrincu at streamwide.ro
Tue Nov 16 17:58:31 CET 2010


Take a look at the config here, it does what you need, you probably have 
to adapt to your specific setup.

http://oss.clusterlabs.org/pipermail/pacemaker/2010-November/008334.html

Regards,
Dan

Robinson, Eric wrote:
>>> Is it possible to deploy a 3-node CRM-based cluster where:
>>>
>>> 	-- nodes A and C share resource R1 on /dev/drbd0
>>>
>>> 	-- nodes B and C share resource R2 on /dev/drbd1
>>>
>>> 	-- resource constraints prevent R1 from running on node B and
>>>       
> prevent 
>   
>>> resource R2 from running on node A?
>>>       
>
>   
>> I don't think I understand what you're trying to do. 
>> Please elaborate.
>>     
>
>   
>> Why would you need to prevent R1 from "running" on 
>> Host B if the resource is shared between A and C? 
>> B is not at all configured to connect to R1, is it?
>>     
>
> It's a three-node CRM cluster where node C acts as a failover for nodes
> A and B, but nodes A and B do not fail over to each other. However, in a
> three-node CRM cluster, all resources are allowed to run on all nodes by
> default. For example, even though resource R1 only physically exists on
> nodes A and C, if node A fails Pacemaker might try to start it on node B
> if we don't put in some kind of constraints. You follow?  
>
> --
> Eric Robinson
>
>
>
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-- 
Dan FRINCU
Systems Engineer
CCNA, RHCE
Streamwide Romania

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