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Beim "Testen" ist gleich die Durchführung erfolgt.

root@b1:~# zpool upgrade

This system supports ZFS pool feature flags.

All pools are formatted using feature flags.

Some supported features are not enabled on the following pools. Once a
feature is enabled the pool may become incompatible with software
that does not support the feature. See zpool-features(7) for details.

Note that the pool 'compatibility' feature can be used to inhibit
feature upgrades.

POOL  FEATURE
---------------
backup
      zilsaxattr
      head_errlog
      blake3
      block_cloning
      vdev_zaps_v2
rpool
      zilsaxattr
      head_errlog
      blake3
      block_cloning
      vdev_zaps_v2

root@b1:~# zpool upgrade rpool

This system supports ZFS pool feature flags.

Enabled the following features on 'rpool':
  zilsaxattr
  head_errlog
  blake3
  block_cloning
  vdev_zaps_v2

root@b1:~# zpool upgrade

This system supports ZFS pool feature flags.

All pools are formatted using feature flags.

Some supported features are not enabled on the following pools. Once a
feature is enabled the pool may become incompatible with software
that does not support the feature. See zpool-features(7) for details.

Note that the pool 'compatibility' feature can be used to inhibit
feature upgrades.

POOL  FEATURE
---------------
backup
      zilsaxattr
      head_errlog
      blake3
      block_cloning
      vdev_zaps_v2

root@b1:~# zpool upgrade backup

This system supports ZFS pool feature flags.

Enabled the following features on 'backup':
  zilsaxattr
  head_errlog
  blake3
  block_cloning
  vdev_zaps_v2

root@b1:~# zpool upgrade

This system supports ZFS pool feature flags.

All pools are formatted using feature flags.

Every feature flags pool has all supported and requested features enabled.

root@b1:~#