Spitfire

Extremely low overhead file and directory transfer, mainly by not bothering with encryption.

spitfire transfer --source-host host1 \ 
    --source-dir /var/run/kafka/logs \
    --destination-host host2 \
    --destination-dir /tmp/spitfirelogs2 

Internally spitfire works by opening a socket on both hosts through nc and using tar to transfer contents.

You'll have no problem saturating dual gigabit uplinks with in-datacenter transfers.