From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Brown Subject: Re: Basic RAID5/6 reshape question Date: Tue, 16 Dec 2008 09:20:09 +1100 Message-ID: <18758.55321.738370.893867@notabene.brown> References: <4940E377.7070907@wasp.net.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: message from Brad Campbell on Thursday December 11 Sender: linux-raid-owner@vger.kernel.org To: Brad Campbell Cc: RAID Linux List-Id: linux-raid.ids On Thursday December 11, brad@wasp.net.au wrote: > G'day all, > > I'm just doing some system upgrades and shuffling some arrays around as part of the process. > All my other current questions have been answered by experimentation, but one. > > I'm going to start with a RAID 6 comprised of 7 x 1TB drives, and reshaping to 10 x 1TB. > I'm doing an experiment right now with re-shaping a RAID-5 of 2 drives into 3 drives which is taking > about 20 hours, from that I'm assuming that a nice big re-shape will take a considerable amount of > time. I have a reliable UPS, I'm more concerned about a drive or cable flaking out. > > What happens if I'm in the middle of a reshape of a RAID 5 or 6 and lose a drive? The reshape continues creating a degraded array. > > Will the array be able to continue to reshape in a degraded state? Yes. The process is designed to survive losing a single drive, or a system crash (but not both). > > Hoping of course that this does not occur, but just trying to plan ahead in case. Sensible! NeilBrown