Today I upgraded 2 of 3 nodes in a cluster from
pve-manager/6.2-15/48bd51b6
Linux 5.4.73-1-pve #1 SMP PVE 5.4.73-1 (Mon, 16 Nov 2020 10:52:16 +0100)
to
pve-manager/6.3-3/eee5f901
Linux 5.4.78-2-pve #1 SMP PVE 5.4.78-2 (Thu, 03 Dec 2020 14:26:17 +0100)
and anything involving ZFS snapshots...