Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751139AbVI1Wxz (ORCPT ); Wed, 28 Sep 2005 18:53:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751150AbVI1Wxy (ORCPT ); Wed, 28 Sep 2005 18:53:54 -0400 Received: from [81.2.110.250] ([81.2.110.250]:10428 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S1751139AbVI1Wxx (ORCPT ); Wed, 28 Sep 2005 18:53:53 -0400 Subject: Re: [PATCH 2/3] Add disk hotswap support to libata RESEND #5 From: Alan Cox To: Jeff Garzik Cc: Lukasz Kosewski , linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org In-Reply-To: <433AEAAE.2070003@pobox.com> References: <355e5e5e05092618018840fc3@mail.gmail.com> <433AEAAE.2070003@pobox.com> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Thu, 29 Sep 2005 00:20:51 +0100 Message-Id: <1127949651.26686.11.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 732 Lines: 16 For PATA the requirements I'm aware of are - Interface for user to say "am about to swap" - Interface for user to say "have swapped" - Must quiesce both master and slave before swap (or one per cable) - Must reset to PIO_SLOW and then recompute modes for both devices becuse it is possible that changing one changes the other timings - The above is true for *unplug* too. A straight unplug may speed up the other drive! - Post hotswap need to reconfigure both drives as if from scratch - 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/