Secondary DNS config

I have 2 DNS servers .. (well, actually, I have a primary that works,
and a RH9 box that has DNS configuration files that do not do anything
..... but that is just getting technical).

Anyway, I was trying to set up a slave DNS, however, it is not doing
it's job. If I make a change on the master, it never makes it to the
slave. I did not really know what I was doing, although I did read a
lot. Both the primary and the secondary are rh9 boxes running bind
(no I do not know what version).

Basically, All I did to configure the slave, is copy all of forwared
and reverse lookup files in the /etc/named directory as well as the
named.conf file from the master to the slave. I then changed (in all
locations of the named.conf file on the slave) all lines that said
"type master" to "type slave" and then added a line to each zone that
was a slave "masters { a.b.c.d; }; ". I then restarted bind on both
the primary and slave.

Does anyone know why my server is not working properly ?

I also had one other question, If the primary DNS goes down, should
the slave continue to serve the requests ?

Thanks,
Peter