====== pool not imported after boot ======

<code bash>
journalctl -b | grep zfs

Created slice system-zfs\x2dimport.slice - Slice /system/zfs-import.
systemd-udev-settle.service is deprecated. Please fix zfs-import-scan.service, zfs-import-cache.service not to pull it in.
Starting zfs-import@backup.service - Import ZFS pool backup...
Finished zfs-import@backup.service - Import ZFS pool backup.
Starting zfs-import-cache.service - Import ZFS pools by cache file...
zfs-import-scan.service - Import ZFS pools by device scanning was skipped because of an unmet condition check (ConditionFileNotEmpty=!/etc/zfs/zpool.cache).
Finished zfs-import-cache.service - Import ZFS pools by cache file.
Reached target zfs-import.target - ZFS pool import target.
Starting zfs-mount.service - Mount ZFS filesystems...
Starting zfs-volume-wait.service - Wait for ZFS Volume (zvol) links in /dev...
Finished zfs-volume-wait.service - Wait for ZFS Volume (zvol) links in /dev.
Reached target zfs-volumes.target - ZFS volumes are ready.
Finished zfs-mount.service - Mount ZFS filesystems.
</code>

Solution:
<code bash>
systemctl enable zfs-import@backup2
</code>

===== Not working solution 1 =====


Add ''rootdelay=20'' to ''/etc/default/grub''
and regenerate grub config:
<code bash>
proxmox-boot-tool refresh
</code>

===== not working solution 2 =====


Force pools to use ''/etc/zfs/zpool.cache'' file:
<code bash>
zpool import backup2
zpool set cachefile=/etc/zfs/zpool.cache backup
zpool set cachefile=/etc/zfs/zpool.cache backup2

zpool get cachefile

update-initramfs -k all -u
reboot
</code>