Ted Ts'o from Google wrote a small spec for a new kind of disk drive that could be partly "traditional" and partly SMR (Shingled Magnetic Recording), and you could convert parts of the disk (at 100GB granularity) between traditional and SMR (and back): https://www.blog.google/topics/google-cloud/dynamic-hybrid-smr-ocp-proposal-improve-data-center-disk-drives/ SMR is supposed to "lower the cost per byte of an HDD by up to 10-20 percent". The spec is being proposed to the Open Compute Project (OCP). Maybe this is something that a future version of Ceph could leverage. Seems easier (though not "easy") with Bluestore than with Filestore. -- Simon. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
