Hi all. I too have spent a day on trying to get a simple lacp 2 nic 802.3ad bond setup on OMV .5.
I googled my butt off and there's not much out there. I read all these thread posts and I too have had the bond_masters missing, the double lines in interfaces, etc. i have it up and working but the speed doesn't seem better than 1 gb and I have NO GW access for updates. Only local lan use. GW pings fail.
I gave this forum one last try and found this thread so I thought I would let the OP, others with this issue and OMV know it's a deal breaker for folks with real and mdadm raid arrays. I need a nas distro that does lacp for throughput for my proxmox vm's.
I really do enjoy this software. The design is clean and the debian base is easier to work with than freebsd or solaris.
I hope this gets sorted out soon so I can use it.
Cheers, Duder