Hi, 
we spend some time looking to use  heartbeat   Pg 9.0  and warm standby
replication  option to configure a "master/slave" system. At the end we 
have implemented  DRBD and STONITH for a master Pg server,  DRBD is been
used for for all Pg db directories the only exception is the Pg software and
backup directory, so far we like  that the  fail over procedure is very
simple and  time efficient , Pg is in consistency state always after a clean
or "immediate/fast" shutdown ; the downside : this solution is protecting us
only  from hardware issues not software/Pg issues aka :Pg data, log files
corruption.
Hope this may help with your decision,
Isabella
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