I'm building a media server on a budget. Currently, the design is to have four 500GB disks in a JBOD-type format giving me one large 2TB store. The problem is if any disk fails, I lose the whole array's data. I'd like to avoid dedicating a disk to parity if possible, so I need to cope with some loss of data being a potential problem.
Most of my media files (~95%) are rips from blu-rays and DVDs of mine. It's a lot of work to re-rip the files, but it's not the end of the world if I only lose some of the files. Just inconvenient.
I'd like to set up a filesystem where I can tolerate 25% loss of media data and have the rest still usable. The OS can be on a separate disk. Aside from creating four independent disks (with their own filesystem), which I'd like to avoid due to the complexity, is there any filesystem or design/configuration that will suit my needs? I plan to use FreeNAS to serve the files across the network.