Cannot import zpool after upgrade.

[notacompletemoron]

This is in direct relation to https://github.com/openzfs/zfs/issues/12322, found this due to a bug report at the Ubuntu Launchpad, and I made a post at https://www.reddit.com/r/AskUbuntu/comments/ooel3v/cant_update_zol_because_of_unmet_dependencies

I was having trouble upgrading the version of zfsutils-linux, and now I cannot access my pool. Ubuntu 18.04.5 LTS (GNU/Linux 5.4.0-80-generic x86_64)

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sudo zpool import TANK This pool uses the following feature(s) not supported by this system: com.delphix:log_spacemap (Log metaslab changes on a single spacemap and flush them periodically.) All unsupported features are only required for writing to the pool. The pool can be imported using '-o readonly=on'. cannot import 'TANK': unsupported version or feature

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sudo zpool import -d /dev/disk/by-label/TANK -f pool: TANK id: 16290916184379626790 state: UNAVAIL status: The pool can only be accessed in read-only mode on this system. It cannot be accessed in read-write mode because it uses the following feature(s) not supported on this system: com.delphix:log_spacemap (Log metaslab changes on a single spacemap and flush them periodically.) action: The pool cannot be imported in read-write mode. Import the pool with "-o readonly=on", access the pool on a system that supports the required feature(s), or recreate the pool from backup. config:

TANK                                                     UNAVAIL  unsupported feature(s)
  mirror-0                                               ONLINE
    wwn-0x5000c500b2ee4433                               ONLINE
    wwn-0x5000c500b2ee40ac                               ONLINE
  mirror-1                                               ONLINE
    TANK                                                 ONLINE
    wwn-0x5000c500b52621f6                               ONLINE
  mirror-2                                               ONLINE
    wwn-0x5000c500b5269466                               ONLINE
    wwn-0x5000c500b526b774                               ONLINE
cache
  ata-Samsung_SSD_860_EVO_250GB_S*-part2
  ata-Samsung_SSD_860_EVO_250GB_S*-part2
logs	
  mirror-3                                               ONLINE
    ata-Samsung_SSD_860_EVO_250GB_S*-part1  ONLINE
    ata-Samsung_SSD_860_EVO_250GB_S*-part1  ONLINE

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I cannot scrub TANK in RO mode, as expected. Serial numbers redacted.

What is my path to resolution?

EDIT: And I just realized that I have a drive down.

[notacompletemoron]

Huh. Looks like I have an old kernel.

zfs version zfs-2.1.0-0york2~18.04 zfs-kmod-0.8.3-1ubuntu12.10

How do I update the kmod?

[gertvdijk]

I was having trouble upgrading the version of zfsutils-linux

zfs version zfs-2.1.0-0york2~18.04 zfs-kmod-0.8.3-1ubuntu12.10

When updating ZFS, you should also update the kernel modules, zfsutils-linux is just the 'userspace' tooling.

First of all; how did you attempt the initial upgrade of that packaged? Installed a PPA or something (that york suffix seems to indicate that)? Then also install the zfs-dkms package to build & install the kernel modules. Then reboot.

FWIW, it's mentioned on this PPA instructions:

For 16.04 and later you need to install zfs-dkms or you'll end up with the kernel's built-in module (and things won't work as expected).

Verify with sudo apt update && apt policy zfs-dkms zfsutils-linux for example that your package sources are providing versions that align with each other.

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