From mboxrd@z Thu Jan 1 00:00:00 1970 From: Janek Kozicki Subject: Re: RAID5 to RAID6 reshape? Date: Mon, 18 Feb 2008 00:54:50 +0100 Message-ID: <20080218005450.6b4bc0b3@szpak> References: <20080217143122.36413814@szpak> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Mark Hahn said: (by the date of Sun, 17 Feb 2008 17:40:12 -0500 (EST)) > >> I'm also interested in hearing people's opinions about LVM / EVMS. > > > > With LVM it will be possible for you to have several raid5 and raid6: > > eg: 5 HHDs (raid6), 5HDDs (raid6) and 4 HDDs (raid5). Here you would > > have 14 HDDs and five of them being extra - for safety/redundancy > > purposes. > > that's a very high price to pay. > > > partition on top of them. Without LVM you will end up with raid6 on > > 14 HDDs thus having only 2 drives used for redundancy. Quite risky > > IMHO. > > your risk model is quite strange - 5/14 redundancy means that either yeah, sorry. I went too far. I didn't have IO controller failure so far. But I've read about one on this list, and that all data was lost. You're right, better to duplicate a server with backup copy, so it is independent of the original one. -- Janek Kozicki |