A great source for Ubuntu help is their community wiki:
Raid1 - https://help.ubuntu.com/community/Installation/RAID1
DHCP - https://help.ubuntu.com/community/DnsAndDhcpServer
If no one else offers to help you at your home, you can always bring
your computer along to the Saturday workshop and we'll see what we can
do. We'll even provide you with coffee :-)
http://wlug.org.nz/SaturdayWorkshop.2007-06-09
-- simon
Hey :-)
Send me an e-mail, I can't say we'll get it completely sorted, but I'll
give it a shot :-)
I can't say I know everything, but I recently managed to get 2x 80GB
PATA HDD running RAID1 (looks like 160GB), then get that RAID1 array
plus a 160GB SATA HDD into another 320GB RAID1 array - don't ask :-P
I will bring this machine over so we can look at its config.
Also my desktop is running Ubuntu 6.06 (Dapper?), and has an eSATA port
- never used it, but might as well bring it along, to see if your
external drive does work etc.
You have spare power cables/network
cables/multiboxes/mice/keyboards/etc?
Unfortunately for the OP, taking an existing install on a single disk
and converting it to a software RAID1 set under linux is fairly tricky
to do. There are howtos around, but it's time consuming and potentially
dangerous, and it's definitely easy and probably quicker to reinstall
the machine and set up RAID1 from within the installer (even the Debian
Sarge installer supported this, btw).