DNS server on multisite environment?

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Guys,

Thanks for you invaluable help!
Now it's aleady clear how to install the boxes.

My initial confusion was if we have to keep two
primary DNS servers, one at each sites to have this
sort of 'clustered' environment.
Then to let the local secondaries to update their zone
files.

But now we'll try to install only on primary server
and 3 secondaries in the following order

site 1
1. primary
2. secondary

site 2
1. secondary
2. secondary

And to get them to download the zone files via AXFR
from the only primary. 

Thanks again!

Regards,

John