From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ipmail02.adl2.internode.on.net ([150.101.137.139]:9505 "EHLO ipmail02.adl2.internode.on.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751591AbdI1LHq (ORCPT ); Thu, 28 Sep 2017 07:07:46 -0400 Date: Thu, 28 Sep 2017 21:07:19 +1000 From: Dave Chinner Subject: Re: Rationale for hardware RAID 10 su, sw values in FAQ Message-ID: <20170928110719.GJ10621@dastard> References: <20170927004302.GB3666@dastard> <20170927043308.GC3666@dastard> <20170928125310.5687097e@harpe.intellique.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20170928125310.5687097e@harpe.intellique.com> Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: Emmanuel Florac Cc: Ewen McNeill , linux-xfs@vger.kernel.org On Thu, Sep 28, 2017 at 12:53:10PM +0200, Emmanuel Florac wrote: > Le Thu, 28 Sep 2017 12:36:39 +1300 > Ewen McNeill écrivait: > > > I'm obviously not an expert in filesystem layout optimisation. But I > > have many years sysadmin experience dealing with lots of types of > > storage, and can write a couple of pages of text on the "background" > > bits next time I have a free moment. The more advanced tunables > > could remain "todo" until there's time for the perfect version... > > > > As you're at it, please mention the potential problems with 512e (512 > bytes blocks emulated) disks, which are the vast majority of shipped > disks nowadays. Doing RAID with these can lead to all sort of trouble > by worsening the read/modify/write problem. That's not a filesystem problem, though. Answering questions like "what is the optimal device sector size for RAID on some random storage hardware" is quite a long way outside the scope the filesystem configuration guidelines.... Cheers, Dave. -- Dave Chinner david@fromorbit.com