[SOLVED] Upgrade from ZFS RAID 1 to ZFS RAID 10

That should work online - check the manpage of zpool (`man zpool` - especially the subcommand 'add')

I hope this helps!
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What Stoiko said.

Just be mindful that it will add another mirrored pair but wont balance so if your pool is already half full it will mostly only use the new pair until they all are at the same amount of free space. So, if it's speed you're looking for it wont necessarily help
shucks. even a zfs send/receive to another pool, outside of these 4 drives, won't balance it out to take advantage of the striping early on?

If you mean completely moving the data rather than just backing it up, then I'm pretty sure that would but that's hard to do if it's your root pool
usually people do the following:
  1. send / recv within pool into a new hierarchy (the received data is newly written, so it will be balanced/compressed/have large blocks/.. whatever you changed)
  2. stop services/guests/.. using the storage
  3. incremental send / recv (to transfer changes since 1)
  4. verify everything has been properly sent
  5. rename original hierarchy (e.g., add '_old')
  6. rename newly written hierarchy to original name (so you don't have to adapt any config files, paths, ...)
  7. start services again
  8. wait a few days (to make sure there are no problems)
  9. delete original hierarchy
you need to have enough space to store everything twice, and you need to know your way around ZFS ;)
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