Looking at the Troubleshooting part of https://pve.proxmox.com/wiki/Upgrade_from_6.x_to_7.0 before doing the upgrade, as having an older install on ZFS, I understand I need to https://pve.proxmox.com/wiki/ZFS:_Switch_Legacy-Boot_to_Proxmox_Boot_Tool first. However:
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NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT FSTYPE
sda 8:0 0 2.7T 0 disk zfs_member
├─sda1 8:1 0 1007K 0 part zfs_member
├─sda2 8:2 0 512M 0 part...Read more