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I don't bother with complicated RAID setups for this particular use case. I suppose if you've got 2 disks the same size then might as well do RAID 0 via mdadm or something but otherwise just add the disks together with LVM and done. If one disk fails you don't have redundancy, but they're only torrents so you can just reload the torrent files and redownload whatever data got lost.

I'm not really a fan of btrfs, it again seems overengineered. I tried it out for a while and having to use a separate command just to see how much space is free was annoying (doubly so that that free space was just an estimated amount). I've never tried zfs but it seems like a similar type of filesystem.

Surely these filesystems have their place in the world but imo not in this particular situation.

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There's absolutely nothing complicated about the basic parity raid that both ZFS and btrfs offer lmao.

You're basically running with all the resilience of RAID0 but none of the performance benefits, all because you can't figure out something fairly simple. In fact most operational tasks are going to be simpler with ZFS than with mdadm - for example, if a disk fails in an mdadm RAID5, you need to replace it with another disk of the same size for a rebuild to proceed. But with "raidz1" (basically ZFS's version of RAID5), you don't need that - it'll actually just automatically rebuild the "array" with one fewer disk (as long as you haven't filled it up so there's room to do so). You can also buy disks at different times with different sizes with no issues.

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