From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ric Wheeler Subject: Re: [git patch] libata resume fix Date: Tue, 30 May 2006 14:40:15 -0400 Message-ID: <447C918F.2080801@emc.com> References: <20060528203419.GA15087@havoc.gtf.org> <1148938482.5959.27.camel@localhost.localdomain> <447C4718.6090802@rtr.ca> Reply-To: ric@emc.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mexforward.lss.emc.com ([168.159.213.200]:31837 "EHLO mexforward.lss.emc.com") by vger.kernel.org with ESMTP id S932383AbWE3Sko (ORCPT ); Tue, 30 May 2006 14:40:44 -0400 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Linus Torvalds Cc: Mark Lord , Benjamin Herrenschmidt , Jeff Garzik , Andrew Morton , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Linus Torvalds wrote: >On Tue, 30 May 2006, Mark Lord wrote: > > >>Not in a suspend/resume capable notebook, though. >> >>I don't know of *any* notebook drives that take longer >>than perhaps five seconds to spin-up and accept commands. >>Such a slow drive wouldn't really be tolerated by end-users, >>which is why they don't exist. >> >> > >Indeed. In fact, I'd be surprised to see it in a desktop too. > >At least at one point, in order to get a M$ hw qualification (whatever >it's called - but every single hw manufacturer wants it, because some >vendors won't use your hardware if you don't have it), a laptop needed to >boot up in less than 30 seconds or something. > >And that wasn't the disk spin-up time. That was the time until the Windows >desktop was visible. > >Desktops could do a bit longer, and I think servers didn't have any time >limits, but the point is that selling a disk that takes a long time to >start working is actually not that easy. > >The market that has accepted slow bootup times is historically the server >market (don't ask me why - you'd think that with five-nines uptime >guarantees you'd want fast bootup), and so you'll find large SCSI disks in >particular with long spin-up times. In the laptop and desktop space I'd be >very surprised to see anythign longer than a few seconds. > > Linus > > With many data centera applications, delayed spin up of SCSI (and increasingly S-ATA) drives is a feature meant to avoid blowing a circuit when you spin up too many drives at once ;-) Ric