Initially USB sticks, because I'd never had a single failure before. Heck, we still have a FN8.x box at work running strong off its original $10 Wal-Mart thumb drive. Everything was fine until 9.2 when they started dropping like flies, which is when I upgraded to the DOMs. I don't have room in my case for any more full sized disks, 2.5" notwithstanding. ZFS was a lousy move. You get consistency checking, at the cost of being the primary cause of the failures in the first place, you get mirroring, which is essentially useless, you get snapshots, which are neat, but not really any different than just backing up your config. Seriously, all of these "amazing" new features they made such a big deal about have turned out to be complete duds when you realize they're eating your disks alive to do it.
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