iTools upgrade strategy

[cw@xxxxxxxxxx]

Greetings all,

I have been prepping for a software upgrade, and before proceeding, I 
need help to come up with a strategy that will cause *no server 
down-time*. In the past, I would just build a drive at the office 
with the new software, migrated sites, test it, then swap the drives. 
I don't have a spare Xserve to test it off-line, I have 
mission-critical sites, and late-night access is not a good option in 
this case.

Current Web server set-up:
[Co-located] Xserve Dual 1GB G4, 1GB RAM, OSXS 10.2.4, iTools 6.5.x, 
WebDNA 4.5.1, sendmail...

[In case it's of use in the equation, the email is on a second Xserve 
on the same network - with extra IP's and drives available for 
testing.]

-I have installed a new Xserve drive module, and installed Panther 
[*client*, updated it to 10.3.3], and Timbuktu on the new drive. I 
have paid upgrades to iTools 7.3, ready to install. For now, I am 
going to stick with WebDNA 4.5.1. Also, I plan to use Post.Office as 
a substitute for sendmail, which I can't shut down either.

I'm stumped... Any suggestions are greatly appreciated, as the docs 
don't appear to cover my situation.

Regards,
-Chris
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