comments and inputs needed - HA

[JM]

hi,

        i wanted to implement HA on a DB production environment.  i was 
thinking of 
using the following combination:

        Heartbeat+DRDB+MySQL
                or
        Heartbeat+RSYNC+MySQL
                or
        ?????
        
        and do you prefer HA over ethernet or HA over a serial cable

        are there things that i need to be worried about?

thanks
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