[Pacemaker] Properly fencing Postgres

[Martin Aspeli]

Hi Serge,

 >> I don't know if the pgsql RA can support "cold standby"
 >> instances.
 >>
 >
 > In my opinion "cold standby" is a server has has access to the data
 > files where PostreSQL is down but can be brought up any time. pgsql RA
 > does exactly that if other resources proved access to the data. What
 > pgsql RA doesn't do is data synchronization in a master/slave way. But
 > as far as I understand this is not required here.

Well, that was certainly the way I envisaged it working, with data 
synchronisation being provided by DRBD + OCFS2, and data integrity 
ensured by STONITH with the Dell DRAC.

That said, if there are better solutions, I'd love to hear about them.

Martin