This is a question that crops up fairly regularly, as different operating systems support different zpool versions. Fortunately, it’s quite easy to find out which versions you are running – simply run: # zpool upgrade If you want a more detailed readout, including the features of the pool version you have, try: # zpool upgrade -v Your output should look something like this: # zpool upgrade -v This system is currently running ZFS pool version 28. The following versions are supported: VER DESCRIPTION — ——————————————————– 1 Initial ZFS version 2 Ditto blocks (replicated metadata) 3 Hot spares and double parity RAID-Z 4 zpool history 5 Compression using the gzip algorithm 6 bootfs pool property 7 Separate intent log devices 8 Delegated administration 9 refquota and refreservation properties 10 Cache devices 11 Improved scrub performance 12 Snapshot properties 13 snapused property 14 passthrough-x aclinherit 15 user/group space accounting 16 stmf property support 17 Triple-parity RAID-Z 18 Snapshot user holds 19 Log device removal 20 Compression using zle (zero-length encoding) 21 Deduplication 22 Received properties 23 Slim ZIL 24 System attributes 25 Improved scrub stats 26 Improved snapshot deletion performance 27 Improved snapshot creation performance 28 Multiple vdev replacements For more information on a particular version, including supported releases, see the ZFS Administration Guide. Or for the more simple command: # zpool upgrade This system is currently running ZFS pool version 28. All pools are formatted using this version.