From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753484AbZBZAUm (ORCPT ); Wed, 25 Feb 2009 19:20:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751208AbZBZAUb (ORCPT ); Wed, 25 Feb 2009 19:20:31 -0500 Received: from rcsinet13.oracle.com ([148.87.113.125]:50742 "EHLO rgminet13.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751088AbZBZAUa (ORCPT ); Wed, 25 Feb 2009 19:20:30 -0500 X-Greylist: delayed 3167 seconds by postgrey-1.27 at vger.kernel.org; Wed, 25 Feb 2009 19:20:30 EST To: david@lang.hm Cc: "Martin K. Petersen" , "H. Peter Anvin" , Matthew Wilcox , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, sandeen@redhat.com Subject: Re: ATA support for 4k sector size From: "Martin K. Petersen" Organization: Oracle References: <1235600698-6446-1-git-send-email-matthew@wil.cx> <49A5CBF7.9000501@zytor.com> Date: Wed, 25 Feb 2009 19:20:00 -0500 In-Reply-To: (david@lang.hm's message of "Wed\, 25 Feb 2009 16\:13\:42 -0800 \(PST\)") Message-ID: User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Source-IP: acsmt704.oracle.com [141.146.40.82] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090202.49A5E034.01AE:SCFSTAT928724,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>>>> "david" == david writes: david> even if we can't get them to give us any info from the drive david> directly, we still want to allow the sysadmin to configure the david> use of the systems when they can find the info in other ways. You can specify RAID parameters on the mkfs.xfs command line today. mke[234]fs have similar knobs. david> if you have the smallest and largest I/O you can submit without a david> penalty and the alignment, isn't the optimal I/O size everything david> between these two? (or at least everything between these two may david> be close enough that defining an 'optimal' size may not be david> worthwhile) These parameters come straight out of SCSI. I described them wrong. maximum is the biggest I/O the device can handle, full stop. Optimal is the preferred I/O size for the array. -- Martin K. Petersen Oracle Linux Engineering