Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 19 Mar 2002 04:29:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 19 Mar 2002 04:29:48 -0500 Received: from twilight.ucw.cz ([195.39.74.230]:38601 "EHLO twilight.ucw.cz") by vger.kernel.org with ESMTP id ; Tue, 19 Mar 2002 04:29:36 -0500 Date: Tue, 19 Mar 2002 10:29:26 +0100 From: Vojtech Pavlik To: Pavel Machek Cc: Jeff Garzik , Olivier Galibert , LKML Subject: Re: [patch] My AMD IDE driver, v2.7 Message-ID: <20020319102926.B9997@ucw.cz> In-Reply-To: <3C8D69E3.3080908@mandrakesoft.com> <20020311223439.A2434@zalem.nrockv01.md.comcast.net> <3C8D8061.4030503@mandrakesoft.com> <20020314141342.B37@toy.ucw.cz> <3C91D571.5070806@mandrakesoft.com> <20020318192004.GB194@elf.ucw.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 18, 2002 at 08:20:05PM +0100, Pavel Machek wrote: > > commands. With the proper sequencing, you can even do power management > > of the drives in userspace. You don't want to do system suspend/resume > > that way, but you can certainly have a userspace policy daemon running, > > that powers-down and powers-up the drives, etc. > > See noflushd, Hdparm is able to powersave disks well, already, and it > was in 2.2.X, too. Not all of them safely, though. Many a drive will corrupt data if it receives a command when not spinned up. You need to issue a wake command first, which hdparm doesn't, it just leaves it to the kernel to issue a read command or whatever to wake the drive ... -- Vojtech Pavlik SuSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/