From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brad Campbell Subject: Re: Fwd: Installing Linux directly onto RAID6 Array........... Date: Sun, 24 May 2015 21:48:09 +0800 Message-ID: <5561D699.80403@fnarfbargle.com> References: <555294A0.6040703@websitemanagers.com.au> <5561B237.4040709@youngman.org.uk> <5561BCA4.4060904@fnarfbargle.com> <5561C6E9.3060706@youngman.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <5561C6E9.3060706@youngman.org.uk> Sender: linux-raid-owner@vger.kernel.org To: Wols Lists , Mikael Abrahamsson , Another Sillyname Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 24/05/15 20:41, Wols Lists wrote: > aiui raid won't help you at all here, will it? Of course it will. > Firstly, if you get write failures, the hard drive should swap the > block, or the write layer should swap it. Nothing to do with raid > whatsoever. Yep.. > And if you get read errors, well, aiui, raid won't help here either - > especially with mirrored raid, you just get a read failure. Raid does > NOT give you error recovery unless the drive physically fails, and if > it's a bad block it gets fixed at the disk or disk driver level - well > below the raid driver. Nope. If you get a read failure it will try and pull from another mirror, and *that* will succeed. Drives don't return dud* data. They either succeed or fail. * Of course I've heard anecdotes from people about that happening, but it's not supposed to happen under *any* circumstances. -- Dolphins are so intelligent that within a few weeks they can train Americans to stand at the edge of the pool and throw them fish.