Well it depends what level raid you are talking about. But yes Raid1 by definition is a backup (for redundancy). It's a mirrored drive, so in the event of a hard-drive failure you can continue on as if nothing happened and retain all data. Of course any and everything exists on both drives...
Providing I understand you correctly;
I would leave your DLINK setup as it was to begin with, then just turn off DHCP on all the other routers your attaching. In doing such you've essentially turned them into switches. You need not make any other configurations to the other routers nor the...
Not that I have tested, but this looks like it should do the trick.
http://komku.blogspot.com/2008/11/install-windows-xp-using-usb-flash-disk.html
Enjoy! :)