[Pacemaker] Drbd dstate to trigger failover

[Shravan Mishra]

Thanks, I understand now.

-Shravan

On Thu, Apr 21, 2011 at 8:06 AM, Lars Ellenberg
<lars.ellenberg at linbit.com> wrote:
> On Wed, Apr 20, 2011 at 09:49:13PM -0400, Shravan Mishra wrote:
>> Wherever there is estates/estate it should be dstates/dstate.
>>
>> Thanks
>> Shravan
>>
>> On Wed, Apr 20, 2011 at 9:46 PM, Shravan Mishra
>> <shravan.mishra at gmail.com> wrote:
>> > Hi,
>> >
>> > I'm using following config for io errors:
>> >
>> >
>> >
>> > resource resource {
>> >  disk {
>> >    on-io-error detach;
>> >    ...
>> >  }
>> >  ...
>> > }
>> >
>> >
>> > The above leads to following  state in case of disk errors:
>> >
>> > Diskless/UpToDate
>> >
>> > Under drbd documentation there is a following line:
>> >
>> > STMT -- "If the disk failure has occured on your primary node, you may
>> > combine this step with a switch-over operation."
>> >
>> > When I look at drbd resource agent's monitor:
>> >
>> > drbd_monitor() {
>> >        local status
>> >
>> >        drbd_status
>> >        status=$?
>> >
>> >        drbd_update_master_score
>> >
>> >        return $status
>> > }
>> >
>> >
>> > Now in the above function the error is reported only based on role not
>> > on estate. drbd_update_master_score is only updating score based on
>> > dstates.
>
> drbd_update_master_score absolutely takes the role into account as well.
> It triggers on role, local disk state and remote disk state.
>
> A Diskless Primary connected to an UpToDate peer
> will receive a master score of 10,
> whereas the UpToDate peer will have a master score of 10000.
>
> Depending on other constraints and settings, that may or may not be
> enough to trigger a switchover right there.
>
>> > My question is can I return error in drbd_monitor if my primary goes
>> > Diskless and then cause the switchover based on the STMT?
>> >
>> > Or  should I be doing something else?
>> >
>> >
>> > Sincerely
>> > Shravan
>> >
>
> --
> : 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.
>
> _______________________________________________
> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>
> Project Home: http://www.clusterlabs.org
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
>