Two Xserves running 10.5 Server and setting up DNS...

Hello.
I have two Xserves (a G5 and a new Intel), both with fresh installs of 10.5 Server on them.
Xserve #1 not going to be hosting any external services (FTP, web, email) and only housing internal, mission critical & confidential data (the server is set up with a mirror RAID on the OS drive as well as mirror RAID on the storage drives + nightly tape backups for offsite storage). Right now there are no plans for enabling iCal on this server as we're trying to keep the server as basic as possible (as we can afford zero downtime on this server), but if the initial setup of 10.5 requires configuration at first run to allow this type of thing, I'd like to deal with it now so as to keep my options open (as I know iCal on 10.5 requires Open Directory enabled).
Xserve #2 is going to host FTP (for external clients) and internal file sharing for the design/production department (basically, for transferring files back and fourth between departments, so no data via this share will be "critical" as it's only temporarily on the server and will always exist in other locations). Even though this server will not host "critical" data, it will share the same backup/RAID scheme as Xserve #1.
So, I'm curious as to how I set up DNS in this situation (so we can associate a domain name to our static IP address). We already have our main domain setup via 3rd-party hosting service (for web & email as we do not want to bring these services in-house), but we're purchasing a second domain that will be associated with company (via a static IP, so we can give a domain name instead of IP address for people needing to connect to the FTP server, make it easier for employees to remember the address for remote connections, etc.).
Because Xserve #2 is going to be hosting FTP, would it make sense to setup DNS on this server and not set it up on Xserve #1? Also, and this could just be me being paranoid, but because Xserve #1 will be housing "critical & confidential" data I want to eliminate as much contact with the outside world as possible with this server, so this is another reason I feel Xserve #2 should have DNS running instead.
Oh, and not sure if this makes any difference, but between the WAN and the LAN is a SonicWALL firewall and currently it deal with port forwarding, etc. depending on what services are being requested from the WAN (ie. remote machine connections, FileMaker remote connections, etc.).
Any advice would be appreciated!
Regards,
Kristin.

There's a couple of things in your post I don't understand:
the server is set up with a mirror RAID on the OS drive as well as mirror RAID on the storage drives
How are you doing this? Both XServes support only three internal drives and two mirrors require 4 drives. Where does the fourth drive come into play?
I'm curious as to how I set up DNS in this situation
There are numerous ways of doing this, but with a single static IP address your best bet is to leave DNS where it is - managed by your hosting provider. Just add a record in the domain zone (e.g. ftp.yourdomain.com) that has the IP address of the public interface your SonicWall firewall. You don't need a separate domain for this. You also don't need to setup internal DNS for this (although you may need internal DNS if you're running Open Directory.
Because Xserve #2 is going to be hosting FTP, would it make sense to setup DNS on this server and not set it up on Xserve #1?
Assuming you're referring to setting up a DNS server - use them BOTH. Make one of the servers the primary server (I'd pick the internal-only server for this) and set the other server to be a slave (so it copies all the zone data from the primary server). That way you have a replica of the data to provide additional resilience.

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