Using a firewire external drive for Raid

Hi
I posted a question related to this earlier but not specifially on this topic, hence this post.
I was watching Lynda.com video tutorial for servers and noted how easy it seemed to set up a raid solution. However since I am going to use a mac mini for a server I cannot have two harddiscs in it. However I can have a firewire external disc as well as usb 2.0 discs. I figure usb is way to slow, but the firewire should be fast enough..so my question is..can I just buy a firewire disc connect it..use diskutility and set up a raid? Or is there something special I need to concern myself with here i.e special type of external disc etc?
It would be supercool if I could do it this way. Might add, this is low traffic personal server and not a critical server at work..still would be nice with raid though. Then I would do time machine via the usb to an external disc.
Cudos to everyone on the list for all your help.

slightly better than a daisy chained raid array is a multiple bay external firewire enclosure that either offers hardware mirroring or can be mirrored in software. i've used these on client servers before, and they generally work fine.
please be sure to consider the pros and cons of running a mini as a server 24/7, as the 2.5" internal drives aren't generally made to do such things. i usually discourage using minis as servers unless budget or other circumstances prohibit something better.

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