So, I've done some testing, thanks to Dusty's setup. I wasn't able to test on Kubernetes because of some setup issues. However, I hammered away at Docker using some IO-intensive applications, including PostgreSQL and Etcd, both of which write data frequently to some unexpected places.
So far I haven't seen any unexpected IO errors from containers running under overlayfs. And having all of storage be one big volume is really nice; it eliminates a longstanding issue we've had with disk allocation; the whole disk is simply available. So +1 on moving to overlayfs for F26. -- -- Josh Berkus Project Atomic Red Hat OSAS
