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I thought this was the goal and purpose of CEPH; Scale out with white box and local disks; No SAN no RAID, primarily local fast SSD to support scale out environments, like noSQL and Casandra.

https://www.openstack.org/summit/openstack-summit-hong-kong-2013/session-videos/presentation/ceph-the-de-facto-storage-backend-for-openstack

http://docs.ceph.com/docs/jewel/start/hardware-recommendations/