>
> 1) setup a cron job to invoke the sync operation every n seconds
>
> 2) sync both ways(no master/slave relationship), the cron job is run
> at every location
>
> 3) Make sure the DBs are not written to when the sync is
> happening.Lock the DB whilst performing
>  the sync

Won't this lock entire tables every n seconds? If the OP wants
immediate replication this 'n' will be very small.
And rsync'ing raw database files is never a good idea.

-- 
Sudharshan S
http://sudharsh.wordpress.com
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