Zfs


 * Hetzner/zfs

ты апгрейдь спокойно систему на машине и перегружайся

zfs поздних версий работают с zpool'ами ранних

затем нужно будет выполнить zpool upgrade

и он подсказку сделает насчет gptzfsboot

zpool upgade gpart bootcode -p /boot/gptzfsboot -i 1 ad4 gpart bootcode -p /boot/gptzfsboot -i 1 ad6

сравни с подсказкой что тебе дадут, но судя по логам, что ты прислал boot партиции я правильно прислал

zpool upgrade -a  This system is currently running ZFS pool version 28.

Successfully upgraded 'tank'

If you boot from pool 'tank', don't forget to update boot code. Assuming you use GPT partitioning and da0 is your boot disk the following command will do it:

gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 da0



gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ad4 gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ad6 bootcode written to ad6

Другое
zpool upgrade  This system is currently running ZFS pool version 28.

The following pools are out of date, and can be upgraded. After being upgraded, these pools will no longer be accessible by older software versions.

VER POOL --- 15   tank

Use 'zpool upgrade -v' for a list of available versions and their associated features. 

zpool status  pool: tank state: ONLINE status: The pool is formatted using an older on-disk format. The pool can still be used, but some features are unavailable. action: Upgrade the pool using 'zpool upgrade'. Once this is done, the pool will no longer be accessible on older software versions. scan: none requested config:

NAME       STATE     READ WRITE CKSUM tank       ONLINE       0     0     0 mirror-0 ONLINE       0     0     0 ad4p3  ONLINE       0     0     0 ad6p3  ONLINE       0     0     0

errors: No known data errors 

zpool upgrade -v This system is currently running ZFS pool version 28.

Дальше описание всех 28 версий

Ссылки
http://www.freebsddiary.org/zfs-upgrade.php