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New Config -> How to import ZFS Pools again

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I misread the line "Preserve current assignments” in New Config, so all Pools ware wiped. I´m strugling to get them back correctly, What is the correct/best practice for doing it.

As always, happy for help.

Solved by JorgeB

  • Community Expert
  • Solution

On main, create a new pool with the same name and number of slots

assign the pool device(s), if there are subpools, don't create them, just assign all the devices together, order is not important, leave the filesystem set to auto

start the array to import the pool

  • Author

Thanks, it worked. I did like this yesterday, nut could not get the share assignment correct.

  • 5 months later...
  • Author

Can I restart this thread?

I wanted to remove the cache drive from a Zpool. Following this guide, did not work. I was not aloud to start the Array after unassigning the cache drive. Then I ran New config, made a pool with the same name as before, and added the drives leaving file system set to auto (without slots for the subpool drives). After starting the Array, the pool drives were not imported. Only option to reformat the drives. I´m in trouble on this.

Any way to fix this? I hope….

  • Community Expert
2 minutes ago, frodr said:

Then I ran New config, made a pool with the same name as before, and added the drives leaving file system set to auto (without slots for the subpool drives). After starting the Array, the pool drives were not imported. Only option to reformat the drives. I´m in trouble on this.

Post the output from zpool import and a screenshot from Main after the new config with the devices assigned but before array start.

  • Author

Screenshot 2025-12-03 at 13.35.58.pngHere:

root@kjell:~# zpool import

pool: lageret

id: 9939463854067277326

state: ONLINE

action: The pool can be imported using its name or numeric identifier.

config:

lageret ONLINE

raidz1-0 ONLINE

sda1 ONLINE

sdb1 ONLINE

sdc1 ONLINE

sdd1 ONLINE

sde1 ONLINE

raidz1-1 ONLINE

sdf1 ONLINE

sdg1 ONLINE

sdh1 ONLINE

sdi1 ONLINE

sdj1 ONLINE

special

mirror-2 ONLINE

nvme4n1p1 ONLINE

nvme5n1p1 ONLINE

pool: cache

id: 8881486878953382648

state: ONLINE

action: The pool can be imported using its name or numeric identifier.

config:

cache ONLINE

mirror-0 ONLINE

nvme1n1p1 ONLINE

nvme2n1p1 ONLINE

pool: tempssd

id: 15879685755596865968

state: ONLINE

status: Some supported features are not enabled on the pool.

(Note that they may be intentionally disabled if the

'compatibility' property is set.)

action: The pool can be imported using its name or numeric identifier, though

some features will not be available without an explicit 'zpool upgrade'.

config:

tempssd ONLINE

nvme0n1p1 ONLINE

Edited by frodr

  • Community Expert
8 minutes ago, frodr said:

special

mirror-2 ONLINE

nvme4n1p1 ONLINE

nvme5n1p1 ONLINE

You are missing these, do another new config, they must be assigned all together with the other devices, not as subpools. Leave the filesystem set to auto, the pool will then be sorted during import.

  • Author

That worked. Thanks!

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