I have been testing OpenMediaVault on my system for about a month now. I now use a Dell PowerEdge T20 server, (Dell's answer to HP Microservers), and after a little bit of work, managed to get all my required stuff running on it. I use the SnapRaid plugin to determine Parity across the drives, with a pooling setup using aufs, it only spins up the drive that has the media on it that I need at the time. It's plugin system is not all that extensive, but the distro itself is put together from start with small NAS/Media Server in mind. Current stable version is 0.5.x, but .6 (1.0) is just around the corner, and will be based off Debian Wheezy for greater hardware compatability.