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"Relocate jails how-to" :
Assumptions:

• The pool you are transferring the jails from is main_pool
• The destination pool is ssd_pool
• The jail root (Jails->Configuration) is /mnt/main_pool/jails
• The new jail root will be /mnt/ssd_pool/jails

1. Turn off all plugins (Plugins->Installed)
2. Stop all jails (Jails->View Jails)
3. Run these commands via CLI:[PANEL]zfs snapshot -r main_pool/jails@relocate
zfs send -R main_pool/jails@relocate | zfs receive -v ssd_pool/jails
zfs get -rH -o name -s received mountpoint ssd_pool/jails | xargs -I {} sh -c "zfs set mountpoint=/{} {}; zfs mount {};"[/PANEL]
4. Change the Jail Root to /mnt/ssd_pool/jails (Jails->Configuration)
5. Start jails/plugins
6. Check that everything works and destroy the original jails dataset (main_pool/jails)