Maybe useful information, I'm not sure: but I was at DellEMC world in 2017 and they showed off this really cool k8s storage tech. It was called RexRay and was obviously being demo'd with ScaleIO in mind.

However I see that it has multiple backends (including CEPH), might be worth looking into as it seemed very fault tolerant and fast. :)

https://github.com/rexray/rexray