From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753600Ab2BTMUa (ORCPT ); Mon, 20 Feb 2012 07:20:30 -0500 Received: from mx1.redhat.com ([209.132.183.28]:58872 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750784Ab2BTMU2 (ORCPT ); Mon, 20 Feb 2012 07:20:28 -0500 Date: Mon, 20 Feb 2012 13:20:22 +0100 From: Karel Zak To: Neil Brown Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org Subject: MD and rotational attribute Message-ID: <20120220122022.GA7466@x2.net.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2011-07-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Neil, I guess that something is wrong with MD. If you create a RAID on ssd (or scsi_debug in my example) than MD device is reported as rotational. Simple example: modprobe scsi_debug dev_size_mb=500 fdisk /dev/sdb ... mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb{1,2} # cat /sys/block/sdb/queue/rotational 0 # cat /sys/block/md0/queue/rotational 1 It seems like a bug. Karel -- Karel Zak http://karelzak.blogspot.com