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1 Login to Proxmox web gui
2 Find the pool name we want to delete, here we use “test” as pool, “/dev/sdd” as the disk for example.
3 Launch Shell from web gui for the Proxmox host/cluster or via SSH
4 Use following commands to unmount and destroy the pool
umount -f /dev/sdd zpool destroy test
5 Format the disks if necessary
fdisk /dev/sdd g w # Explanation format the disk /dev/sdd Use GPT format Write/Commit the changes
6 Now we can bring back the Proxmox web gui, look at the /dev/sdd, it is now available for other usages.