I don't think anyone has suggested this, but is there any reason you wish to have 2 separate systems instead of a single one? I would VERY STRONGLY recommend trying Flexraid out before you commit to UNRAID. Brahim (the creator of FlexRAID) has done some amazing stuff with it in the last few months and the latest web GUI based interface for FlexRAID is the bees knees
. You can see some screenshots of the interface here:
http://wiki.flexraid.com/2011/04/03/flex...-settings/
While the real-time RAID is still being improved, the Snapshot RAID solution has been rock stable since last year, and I have been using it without any issues over the last 8 months. While I won't go into all the reasons I think it is a great solution, the one nice thing is that it installs as just another software/service on your OS and so you can have it running on your main system, without the need of having yet another machine running 24x7 and sipping power. Apart from that, it is completely free, and allows you to very easily extend the number of disks in your RAID set-up.
I've been in the same situation as you and after doing a lot of research, I have come up with a solution that works great for me. After realizing how much power my main PC was drawing by leaving it on 24x7, I decided to build myself a powerful, yet efficient HTPC that would also serve as my personal FTP server, torrent downloader, media transcoder, etc. I just finished putting together an i3-2100t build in an Apex MI-008 case (mini-ITX board) that runs really fast, consumes very little power, is very quiet, and also has FlexRAID running and is hooked up to my 4 drive, USB 3.0 storage box (4x2TB). I could easily add another 4 or 8 drive box on the other USB 3.0 port to extend the capacity of my RAID if needed.
While some people will say that Unraid gives you a lot of stability, and you never need to reboot it, I've found Windows 7 to be rock stable on my laptop and desktop over the last couple of years. I just don't see the need to have a separate machine running 24x7 and drawing more power than needed.
Some reasons not to go for my recommendations would probably be:
- If you plan on having a huge number of drives and want them hidden away, and physically separate from your HTPC set-up. However, you still need to have LAN wiring from the other system to your HTPC, so it is roughly equivalent (i.e., you could get a really long USB 3.0 cable instead)
- You actually do prefer having 2 separate machines for each of their individual purposes