From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Dan Williams" Subject: Re: Paranoid read mode for raid5/6 Date: Mon, 11 Jun 2007 09:39:37 -0700 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: Mattias Wadenstein Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 6/11/07, Mattias Wadenstein wrote: > Hi *, > > Is there way to tell md to be paranoid and verify the parity for raid5/6 > on every read? I guess this would come with a (significant) performance > hit, but sometimes that's not a big deal (unlike disks scrambling your > data). > > Also, regarding data paranoia, for check/repair of a raid6, is the effort > made to figure out which is the misbehaving participant device, or is > parity just blindly recalculated? > This is something that is not available today, but is something I am looking to implement. Especially for the raid6 case where hpa showed that not only can corruption be detected, it can be corrected. > /Mattias Wadenstein Dan