Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932663AbXAVVDV (ORCPT ); Mon, 22 Jan 2007 16:03:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932658AbXAVVDV (ORCPT ); Mon, 22 Jan 2007 16:03:21 -0500 Received: from out4.smtp.messagingengine.com ([66.111.4.28]:55354 "EHLO out4.smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932664AbXAVVDU (ORCPT ); Mon, 22 Jan 2007 16:03:20 -0500 X-Sasl-enc: fq3nAOyoDiTJ973RHnYzpv3Z7xGvHlEKQK5afU2w5/X3 1169499798 Date: Mon, 22 Jan 2007 19:03:12 -0200 From: Henrique de Moraes Holschuh To: Soeren Sonnenburg Cc: Tejun Heo , Jeff Garzik , Linux Kernel Subject: Re: SATA hotplug from the user side ? Message-ID: <20070122210312.GD4516@khazad-dum.debian.net> References: <1168588629.5403.7.camel@localhost> <45A7BFB0.9090308@garzik.org> <1168639639.3707.6.camel@localhost> <45A83C22.6050409@gmail.com> <1168672966.3707.24.camel@localhost> <45AAE52B.2070705@gmail.com> <1169456682.2901.18.camel@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1169456682.2901.18.camel@localhost> X-GPG-Fingerprint: 1024D/1CDB0FE3 5422 5C61 F6B7 06FB 7E04 3738 EE25 DE3F 1CDB 0FE3 User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1655 Lines: 32 On Mon, 22 Jan 2007, Soeren Sonnenburg wrote: > - For SIL3114 and SIL3124 you don't have to run any commands at all. It > should notice when you yank the cable, or plug in a new device. All you > have to do is to stop using the devices before unplugging, e.g. unmount > partitions on the disk or remove the disk from a dm setup). One can > validate which disks are attached using ``scsiadd -p''. Note that the > device name may change from e.g. /dev/sdd to /dev/sde on a > remove/reinsert cycle (this can be fixed by using udev-provided > persistent names). Also note that it is perfectly normal to see messages > like this in dmesg: Does SATA electrical conector keying let the disk firmware unload heads before the user manages to pull it out enough to sever power? If it does not, the drive will do an emergency head unload, which is not good and will likely reduce the drive's lifetime. Using hdparm -Y before the unplug, or scsiadd -r (on a kernel that has Tejun's new patch to optionally issue an START_STOP_UNIT to the SCSI device enabled) is probably a good idea. Unless it is a shared SATA port (I don't know if such a thing exists yet) and another box is talking to the disk, etc. -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh - 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/