From mboxrd@z Thu Jan 1 00:00:00 1970 From: Simon Leinen Subject: "Hybrid SMR" drive spec proposal for OCP Date: Mon, 13 Nov 2017 17:08:06 +0100 Message-ID: Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from teruel.switch.ch ([130.59.193.63]:59650 "EHLO teruel.switch.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753034AbdKMQOB (ORCPT ); Mon, 13 Nov 2017 11:14:01 -0500 Received: from surlej.switch.ch (surlej.switch.ch [IPv6:2001:620:0:1001::69]) by teruel.switch.ch (8.14.4/8.14.4/Debian-4+deb7u1) with ESMTP id vADG868n031481 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Mon, 13 Nov 2017 17:08:08 +0100 Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel@vger.kernel.org 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.