Any news about this? I would like to know if macOS can use SMB 3 multichannel and use dual nics in bonded mode to achieve dual connections to the same server session. I've tried this with a 2012 R2 HP server with 2 bonded ethernet interfaces and an old MacPro 5.1 running High Sierra bonded ethernet and I couldn't make it happen. The server is apparently supporting Multichannel smb3 as I checked it.
It apparently works with macOS and a single 10Gbe adapter (Thunderbolt to 10Gbe adapter or iMac pro) and up to 4 connections to the same server/session to utilise the whole 10Gbe bandwitdth. The server should prefeeably have SMB require signing set to disabled/off (LanmanServer in current control set) antivirus off and the macOS client should have "signing=off" in nsmb.conf for best performance.
LACP haven't supported dual connections to same server before Multichannel SMB 3, but I was hoping it would now. I can't check Multichannel status in macOS (don't know how/if possible). I now the old Intel interfaces in the MacPro 2010 supports RSS but maybe not in macOS and it doesn't matter as I want the bonded ports to support 1 connection each to the same Windows server (bonded interfaces for "ease of configuration" - don't want a multiple subnet configuration if possible, but that's what Samba 4 with experimental support for Multichannel SMB seems to need if running a NAS for example). I think Windows to Windows support dual/quad gigabit LACP trunks between Workstation/clientOS and Server for up to a 4 Gigabit "channel". Didn't Linus write about that?
I might test with a newer Mac and 2 ethernet "dongles" and possibly with different subnets instead of LACP trunks before I give up. Just a hassle to get all needed equipment together and/or configuration changes in production machines...
