Hi.
On my hardware CEPH fail after upgrade pve-kernel from 4.13.4-1 to 4.13.8-2 because MTU 9000 stop working.
"ip link" shows proper MTU but "ping -M do" with packet larger than 1500 doesn't work, after rollback kernel version all forks fine!
I have bonded interfaces on Intel 82580 cards...
