From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adam Goryachev Subject: Re: Paranoid mode for RAID-1 ? Date: Mon, 27 Apr 2015 16:48:19 +1000 Message-ID: <553DDBB3.2010306@websitemanagers.com.au> References: <972437107.22507366.1430116679975.JavaMail.zimbra@laposte.net> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <972437107.22507366.1430116679975.JavaMail.zimbra@laposte.net> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 27/04/15 16:37, Jean-Baptiste Thomas wrote: > I'm looking for a way to get MD to operate in a mode in which > reading a sector from a RAID-1 device would not succeed until it > got matching data from at least two components. > > Recent experience[1] suggests that a transient problem in one > disk can completely hose a four way RAID-1 array, which is > otherwise supposed to still be fine after a triple total > failure. I'm hoping that a paranoid mode would have prevented > that. There isn't any such thing that I am aware of in Linux MD RAID. However, I've heard that if you want data integrity, then you could use zfs, which supports RAID as well as data checksums to ensure that the data read back matches the data you wrote.... Personally, I've never used zfs, and there might be other FS's that will have the feature as well (eg, btrfs etc). Hope that helps... Regards, Adam -- Adam Goryachev Website Managers www.websitemanagers.com.au