Aha. The problem was that in creating a backup snapshot, I inadvertently mounted the backup at /.
Code:
# zfs list -ro canmount,mountpoint,mounted,name
CANMOUNT MOUNTPOINT MOUNTED NAME
on /backupmirror_stiw4tb/rpool/ROOT yes backupmirror_stiw4tb/rpool/ROOT
on / yes backupmirror_stiw4tb/rpool/ROOT/pve-1
on /rpool yes rpool
on /rpool/ROOT yes rpool/ROOT
on / yes rpool/ROOT/pve-1All I needed to do is:
Code:
# zfs set mountpoint=none backupmirror_stiw4tb/rpool/ROOT/pve-1... reboot and all good.
There was a similar post about zfs mountpoints and a similar error but I'm afraid I can't find it! Thanks to them anyway.
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