umount /var/lib/vz
 
lvremove /dev/vg/data
 
mdadm --stop /dev/md4
mdadm --remove /dev/md4
mdadm --zero-superblock /dev/sd[abcd]4
 
#retirer les anciens montages
nano /etc/fstab
 
zpool create -f -o ashift=12 zfspool raidz /dev/sda4 /dev/sdb4 /dev/sdc4 /dev/sdd4
 
zpool list
zfs list
 
zfs create zfspool/vz
zfs set mountpoint=/var/lib/vz zfspool/vz
zfs mount -a

https://www.ma-solution.fr/ovh-soyoustart-cree-un-partition-zfs-sur-un-serveur-dedie/