From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Rowe Subject: Warm swap? Date: Wed, 17 May 2006 11:11:03 +0100 Message-ID: <1147860663.4547.122.camel@kenny> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from dot.ex.ac.uk ([144.173.6.11]:24762 "EHLO dot.ex.ac.uk") by vger.kernel.org with ESMTP id S1750772AbWEQKLF (ORCPT ); Wed, 17 May 2006 06:11:05 -0400 Received: from phobos.ex.ac.uk ([144.173.228.5] helo=phobos) by dot.ex.ac.uk with esmtp (Exim 4.62/mail) id 1FgIzg-0003hv-8E for linux-ide@vger.kernel.org; Wed, 17 May 2006 11:11:04 +0100 Received: from kenny ([144.173.228.126]) by phobos with esmtp (Exim 4.24) id 1FgIzg-00019h-5D for linux-ide@vger.kernel.org; Wed, 17 May 2006 11:11:04 +0100 Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: linux-ide@vger.kernel.org I played around with RAID1 removeable sata drives on a 2.6.9 kernel recently (RH Enterprise clone) and basically found that hot-swap killed the system but warm-swap (remove the disk from all md devices, then pull it out) worked most of the time. But on one occasion the system froze when I plugged the disk back in. What (if any) is the status of warm swap? I don't see it mentioned much but in terms of its usefulness to a systems manager the difference between cold-swap and warm-swap is huge, the difference between warm- swap and hot-swap is tiny. I would MUCH rather have warm-swap now and hot-swap later than both later if that were possible. Thanks for all your work on libata. John