From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030228AbWFATm4 (ORCPT ); Thu, 1 Jun 2006 15:42:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030232AbWFATm4 (ORCPT ); Thu, 1 Jun 2006 15:42:56 -0400 Received: from mail.tmr.com ([64.65.253.246]:3000 "EHLO gaimboi.tmr.com") by vger.kernel.org with ESMTP id S1030228AbWFATm4 (ORCPT ); Thu, 1 Jun 2006 15:42:56 -0400 Message-ID: <447EF7BE.1020005@tmr.com> Date: Thu, 01 Jun 2006 10:20:46 -0400 From: Bill Davidsen Organization: TMR Associates Inc, Schenectady NY User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.11) Gecko/20050729 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Jens Axboe CC: Robert Hancock , linux-kernel Subject: Re: [git patch] libata resume fix References: <6hAdo-5CV-5@gated-at.bofh.it> <6hXD0-6Y9-1@gated-at.bofh.it> <6icsx-4vp-33@gated-at.bofh.it> <6ih8Y-3ba-15@gated-at.bofh.it> <6iH3h-2xw-59@gated-at.bofh.it> <447E5EAD.5070808@shaw.ca> <20060601134802.GK4400@suse.de> In-Reply-To: <20060601134802.GK4400@suse.de> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jens Axboe wrote: >On Wed, May 31 2006, Robert Hancock wrote: > > >>Bill Davidsen wrote: >> >> >>>The trade-off is that if I have a 15k rpm SCSI drive, it would take a >>>lot of design changes to make it spin up quickly, and improve a function >>>which is usually done on a server once every MTBF when replacing the >>>failed unit. >>> >>>I think the majority of very large or very fast drives are in systems >>>which don't (deliberately) power cycles often, in rooms where heat is an >>>issue. And to spin up quickly take a larger power supply... 30 sec is >>>fine with most users. >>> >>>Couldn't find a spin-up time for the new Seagate 750GB drive, but the >>>seek sure is fast! >>> >>> >>I wouldn't guess that even a 15K drive would take nearly that long. For >>boot time on servers it doesn't matter much though, disk spinup time is >> >> > >I do use a 15K rpm drive in my workstation (hello git!), and the spin up >really isn't that bad. Less than 10 seconds for the actual spin up, I >would say. > > Sounds about right, but clearly longer than the 2 sec mentioned early in this thread. I think a long delay is okay as long as it gets stopped when the drive does come ready. > > >>in the noise compared to the insane BIOS delays on most of them during >>bootup. Like on some servers (ahem.. IBM) which have about a 15 second >>delay on the main BIOS screen, 10 second delays on every network boot >>ROM, a 1 minute delay on the SCSI controller before it even starts >>scanning the bus, then another good 10 seconds before it starts booting. >>Gets annoying after a few reboots.. >> >> > >Indeed, the BIOS bootup time on servers is typically anywhere from >really bad to truly awful. > > > I try *very* hard not to do bootup on servers, the paperwork involved with an outage takes longer than the boot time ;-) -- bill davidsen CTO TMR Associates, Inc Doing interesting things with small computers since 1979