That's pretty much it, i.e. VLAN devices (ethX.1234) take 5 additional characters for instance. 8 was chosen so there's still some wiggle room for autogenerated names for network devices.
thanks!
Most likely the Web UI showed a state `running` state for the VM 109 because corosync or cluster were in no quorum and status updates from pvestatd couldn't propagate.
Hard to know/confirm without syslog.