Hi, > Is this in the blktap layer or in librbd? FWIW, when rbd cache = true, > the writes will get merged by the cache and written out in large extents > on flush. In the blktap layer. I don't have the cache enabled because FLUSH request from the VM are not forwarded down to that layer, when you ack a request, it consider that it's been written to disk. Cheers, Sylvain -- 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