I'm building two NAS machines for home to replace the xserve RAID that is fast, but sucks down as much juice as a hairdryer running 24/7. Not very green, and not so easy on the wallet when I don't need the speed.
I've configured one with freenas, as I can set it up to be a time machine backup device (super awesome) but it doesn't run the latest version of zfs.
So, I tried nexentastor, which is free if you are storing under 12tb of data. It is built on opensolaris, has a slick web gui, and is made for enterprise solutions. Unfortunately, its rsync is completely busted. In attempting to back up a volume of 450gigs (my household's music) it backed up 780gigs of data without saying that it finished the job. Hogging all the bandwidth from my freenas server for two days without actually properly copying the files is a no-go. I expect it to copy the files. once. the way rsync is supposed to. Then copy any changes, not replicate the data again. The nexentastor manual is so completely out of date it is talking about features in a much older version of the software that it was impossible to figure out how to rectify this problem. somehow copying 450gigs to take up 780+ gigs with zfs dedup on means there is a big bug somewhere.
Now I've gone back to opensolaris, and this time I read the installation manual and had a nice, clean, working install.