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I wonder if the lack of help from LACP was because DRBD is using only 1 TCP session, which would only get hashed to one or the other member link?

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Might be a case where MPTCP (http://www.multipath-tcp.org/) would help with aggregating multiple links.

Correct me if I'm wrong but I'm not sure MPTCP would help as LACP is generally SRC/DST MAC based and shares a uses a single IP?

You are right in that LACP bonding methods cannot increase the throughput of a single flow to gt any single link in the group (the balancing method can utilise src/dst MAC, IP and sometime L4 ports).

MPTCP establishes multiple subflows across individual IP paths and can load balance or failover across all subflows. Applications do not need to be rewritten to take advantage of it. I'm not sure if that includes kernel modules like DRBD though. I suppose someone needs to find out :)

I could have a play and report back if I get time?

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