If you don't mind, can you give some more details on what you don't like about mnesia? Everybody says it's awful, and it surely has warts, but I've seen it scale ok to 512GB+ datasets in disc_copies tables, and it works alright with a couple caveats.

a) Not sure if it changed, but mnesia startup was very brain damaged -- fixing up the local data from disc, then throwing it all away to load from peers is a lot of wasted time. It's much faster to remove all the local tables on disk before starting the node so it short circuits to copying from the peers. Even when it's faster, sending over half a terrabyte of data takes a while. Some sort of persistent transaction logs for peers would be nice.

b) network partitions aren't fun at all

c) we direct mnesia read and write for a key into a specific process to enforce serialization, and then we use dirty read/writes; so we skip all the locking.

d) we've certainly patched a lot of things in transaction sending and receiving over long distances, especially needed if your network isn't clean.

Anyway, thanks for your thoughts all over this thread.