Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753079AbaKGTRr (ORCPT ); Fri, 7 Nov 2014 14:17:47 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:30235 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751793AbaKGTRp (ORCPT ); Fri, 7 Nov 2014 14:17:45 -0500 To: Chris Friesen Cc: "Martin K. Petersen" , Jens Axboe , lkml , , Mike Snitzer Subject: Re: absurdly high "optimal_io_size" on Seagate SAS disk From: "Martin K. Petersen" Organization: Oracle Corporation References: <545BA625.40308@windriver.com> <545BAD05.3050800@windriver.com> <545BB3AB.8070409@windriver.com> <545BC88A.7060706@windriver.com> <545C5A1B.9020206@windriver.com> <545D13FF.6090306@windriver.com> Date: Fri, 07 Nov 2014 14:17:37 -0500 In-Reply-To: <545D13FF.6090306@windriver.com> (Chris Friesen's message of "Fri, 7 Nov 2014 12:48:31 -0600") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Source-IP: ucsinet22.oracle.com [156.151.31.94] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>>>> "Chris" == Chris Friesen writes: Chris> Apparently the "hdparm -I" command is giving bogus data as well. Chris> I've seen that happen if the drive is on a RAID controller--I Chris> assume that could cause problems with firmware updates too? I'd suggest trying /dev/sgN instead. But yes, some RAID controllers require you to use their tooling and won't allow direct passthrough. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/