[Pacemaker] split brain in drbd dual primary setup

[unni krishnan]

Is that possible in dual primary mode. Is there any data loss that can
occur. I my case I am running the cluster as a load balancer, with VPS
running at both the nodes. with ocfs2 as the file system in centos 5
there is no libdlm

http://picasaweb.google.com/lh/photo/A7CUF3b_SkzJ0NZKbkyyng?feat=directlink




On Wed, Dec 9, 2009 at 10:12 PM, Lars Ellenberg
<lars.ellenberg at linbit.com> wrote:
> On Tue, Dec 08, 2009 at 09:24:57AM +0100, Andrew Beekhof wrote:
>> On Mon, Dec 7, 2009 at 2:17 PM, unni krishnan <unnikrishnan.a at gmail.com> wrote:
>> > Ok, one more doubt. How heartbeat + pacemaker is going to detect that
>> > the drbd is in stand alone state. There is no cluster partition. Only
>> > drbd is disconnected.
>>
>> resource monitoring.
>> i would assume the RA looks for this case
>
> You need resource level fencing.
> Have a look for fencing, the fence-peer handler,
> and "crm-fence-peer.sh" in the DRBD User's Guide.
>
> --
> : Lars Ellenberg
> : LINBIT | Your Way to High Availability
> : DRBD/HA support and consulting http://www.linbit.com
>
> DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
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-- 
Regards,
Unni