Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755354AbYHMUit (ORCPT ); Wed, 13 Aug 2008 16:38:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752590AbYHMUik (ORCPT ); Wed, 13 Aug 2008 16:38:40 -0400 Received: from iolanthe.rowland.org ([192.131.102.54]:57386 "HELO iolanthe.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752470AbYHMUik (ORCPT ); Wed, 13 Aug 2008 16:38:40 -0400 Date: Wed, 13 Aug 2008 16:38:39 -0400 (EDT) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: "Leisner, Martin" cc: Oliver Neukum , Linux-pm mailing list , kernel list , , , Pavel Machek , Stefan Richter Subject: RE: [linux-pm] Power management for SCSI In-Reply-To: <556445368AFA1C438794ABDA8901891C094876DA@USA0300MS03.na.xerox.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 738 Lines: 21 On Wed, 13 Aug 2008, Leisner, Martin wrote: > Regarding these scsi suspend patches, there's a general > problem to drop power on disk devices on a running system. > I discussed it in: > > http://www.gossamer-threads.com/lists/linux/kernel/811598 There's a much worse problem which that thread completely ignored: When you turn off power to a disk device, to the system it looks like a hot-unplug event. Any mounted filesystems or memory mappings on that disk will be lost. Alan Stern -- 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/