I lost a ZFS pool once. The cause ultimately turned out to be a slowly failing PSU. (It was an expensive OCZ PSU, too, which is why I didn't suspect it as qui

I lost a ZFS pool once. The cause ultimately turned out to be a slowly failing PSU. (It was an expensive OCZ PSU, too, which is why I didn't suspect it as quickly as I probably should have. OCZ did replace it under warranty without argument.) It was a development machine, so it wasn't being backed up. I thought it was just one disk going bad; by the time it was clear that it was something worse than that, it was too late. Most of the important contents of the pool had been checked into the VCS, but not everything. I wound up grepping the raw disk devices to find the latest versions of a couple of files. Any filesystem would have had serious trouble in such a situation, of course. But I can't help thinking that picking up the pieces might have been easier with, say, EXT3. On the other hand, I think it speaks well for ZFS that a slowly failing PSU seems to be almost the only way to lose a pool.