Ed White has been doing it in production on RHEL/CentOS for a number of years now. He's got a great write-up on a "roll your own" clustered ZFS-based SAN replacement here: https://github.com/ewwhite/zfs-ha/wiki
You can probably hit-up Ed via Github or Server Fault if you want to talk to him about it directly.
We run Kafka (and I believe Cassandra) on top of Centos/ZFS in AWS and haven't had any issues so far. (About a TB of data moving through every 3 days)