[Linux-HA] Understanding HA

[credog]

Hello,

New to HA and have just been tasked to revamp some systems that were set
up by others. The two servers in question have two interface cards with
one connected to the Internet (routable ips - eth0) and the other
connected via a crossover cable (private ips - eth1).  After doing a
tcpdump I noticed that the heartbeat is bcasting on eth0 on both
machines.  After looking at the config files the bcast directive is in
fact pointing to eth0. After reading all the documentation it seems that
eth1 should be used for the heartbeat.  Is there a good reason that it
may have been done this way?  Also, I will be upgrading the boxes one at
a time and verifying that the secondary works before I rework the other.
Can I  set the bcast directive to both eth0 and eth1 on the secondary so
the heartbeat will continue to function until I get the primary
configured to only use eth1? Then I can set the secondary to use only
eth1. Also, I would like to use DRBD.  Is it acceptable to use the
private network (crossover cable - eth1) with DRBD and also have the
heartbeat bcast on eth1?

Thanks