From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luben Tuikov Subject: Re: ioctls, etc. (was Re: [PATCH 1/4] sas: add flag for locally attached PHYs) Date: Mon, 24 Oct 2005 11:14:34 -0400 Message-ID: <435CFA5A.2030104@adaptec.com> References: <4359440E.2050702@pobox.com> <43595275.1000308@adaptec.com> <435959BE.5040101@pobox.com> <43595CA6.9010802@adaptec.com> <43596070.3090902@pobox.com> <43596859.3020801@adaptec.com> <43596F16.7000606@pobox.com> <435A1793.1050805@s5r6.in-berlin.de> <20051022105815.GB3027@infradead.org> <1129994910.6286.21.camel@sipan.sipan.org> <20051022171943.GA7546@infradead.org> <435CE6CA.4070704@adaptec.com> <1130168495.12873.27.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from magic.adaptec.com ([216.52.22.17]:58572 "EHLO magic.adaptec.com") by vger.kernel.org with ESMTP id S1751078AbVJXPOo (ORCPT ); Mon, 24 Oct 2005 11:14:44 -0400 In-Reply-To: <1130168495.12873.27.camel@localhost.localdomain> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Alan Cox Cc: Christoph Hellwig , Sergey Panov , Stefan Richter , linux-scsi@vger.kernel.org, Linux Kernel , Jeff Garzik , andrew.patterson@hp.com, Christoph Hellwig , "Moore, Eric Dean" , jejb@steeleye.com, Linus Torvalds On 10/24/05 11:41, Alan Cox wrote: > On Llu, 2005-10-24 at 09:51 -0400, Luben Tuikov wrote: > >>controls and how. Understanding how the factory workers use it and what >>they expect. Understanding the code (which may not be as easy). Then it >>is rewritten so that it can be easily supported and maintained. > > > Very very rarely, because it means down time and supporting two systems > at once. Take a look at the australian customs fiasco or the british > passport office disaster to see why (actually almost any large > government IT project where politics dictated 'write new stuff so I can > announce it in parliament'). > > The smart factory update would occur piece by piece. Starting with the > most pressing problems (ie fastest ROI) and working to a plan that ends > up with the system modular and clean. > > You don't turn a steel plant off for a software upgrade. There was 0 (zero) effective downtime to the factory. Luben -- http://linux.adaptec.com/sas/ http://www.adaptec.com/sas/