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ZFS is fantastic. From my point of view it's like lvm2, mdadm and LUKS, only everything in one interface, much more consistent and everything is hot-plug out of the box. You can create combinations of disks of any complexity, add or remove volumes at any time, and it just works. You can even dump the whole ZFS volume and gzip it into backup out of command line. Plenty of features, I've started using it like a year ago and still learning.