Remove rpool (which I am booting from) and reinstall on other disk. How?

[DanH]

I want to re-install proxmox from scratch, but use another two disks in a zfs mirror on the same machine.
While installing, it tells me that there is already a zpool "rpool" and therefore I cannot install proxmox.
Anyway, I chose to rename the pool to something like rpool-OLD-8432200694685522949.
But once booted, I cannot destroy it because it is "busy"

How can I delete that rpool-OLD-8432200694685522949?
I do not care about the data on the disks.

 

[Daniel_Dog]

Try to boot into a live envoirment or a rescue OS.
Then just wipe te partitions of the disks with GParted or any other disk managing tool.

 

[DanH]

Done. Thanks.