[Pacemaker] Resource won't switch from one node to another during power shutdown

[Andrew Beekhof]

On Fri, Apr 24, 2009 at 16:02, Dejan Muhamedagic <dejanmm at fastmail.fm> wrote:
> Hi,
>
> On Fri, Apr 24, 2009 at 10:06:24AM +0200, Andrew Beekhof wrote:
>> On Fri, Apr 24, 2009 at 09:49, Juha Heinanen <jh at tutpro.com> wrote:
>> > Andrew Beekhof writes:
>> >
>> > ?> + ? ? ? ?crm_config_err("NOTE: Clusters with shared data need STONITH to
>> > ?> ensure data integrity");
>
> Good! Now crm will also refuse to commit such a configuration.
>
>> > is special stonith hardware a must or is there some poor man's stonith
>> > solution, for example, for shared mysql storage?
>>
>> If you have a shared disk, SBD is an option.
>> Failing that ssh is better than nothing but still not recommended.
>
> With ssh they risk zero availability in case of network problems
> between the hosts (i.e. what they are seeing right now).

At least their data would survive, but your conclusion below is
basically correct.

> The
> other day somebody expected the suicide plugin to fix split
> brain. The ssh should be for testing only. And suicide just for
> single-node clusters.