ZFS tuning/usage on Qubes OS

ZFS users, do you tune ZFS for your system?

  • Do you use dedup for your VMs?
  • What recordsize do you use?
  • What compression algo do you use?
  • Which Qubes pool driver do you use, ZFS or file-reflink?
  • How do you organize your datasets?
  • How do you mitigate/handle zpool fragmentation?
  • Do you use ZFS as your rootFS?

I’m mainly asking because I struggle with zpool fragmentation, but I’m also wondering how other users setup their systems.