This is a great way to show how RAID works in "slow motion" ;-)

I've done similar for demonstrating how UDP and TCP works using IP-over-AX.25 and 1200bps modems. If you configure one end to be at a slightly different pitch it'll still sync but it'll give that end a different "voice" so you can hear which side is talking.

It takes a couple of minutes to do an ssh handshake, so with verbosity turned up a bit you can work your way through everything and see how the magic happens!