From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from 220-245-31-42.static.tpgi.com.au ([220.245.31.42]:34631 "EHLO smtp.sws.net.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751682AbaGLBXn (ORCPT ); Fri, 11 Jul 2014 21:23:43 -0400 From: Russell Coker To: constantine Reply-To: russell@coker.com.au Cc: linux-btrfs@vger.kernel.org Subject: Re: Btrfs and LBA errors Date: Sat, 12 Jul 2014 11:23:38 +1000 Message-ID: <3431118.WpiWX9X6ip@xev> In-Reply-To: References: <5907875.Oun3LlLFiV@xev> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Fri, 11 Jul 2014 21:29:07 constantine wrote: > Thank you very much for your response: > > # file -s /dev/sda1 /dev/sdc1 > /dev/sda1: BTRFS Filesystem label "partition", sectorsize 4096, > nodesize 4096, leafsize 4096, > UUID=c1eb1aaf-665a-4337-9d04-3c3921aa67e0, 1683870334976/3010310701056 > bytes used, 2 devices > /dev/sdc1: data Looks like the primary superblock on /dev/sdc1 is corrupt. http://www.funtoo.org/BTRFS_Fun#btrfs-select-super_.2F_btrfs-zero-log The above URL documents how to use the other superblocks. It notes that you only get one chance - if you do this wrong you will dramatically reduce the probability of getting your data back. Do not do this on the master copy of your data! Buy 2 disks of equal or greater capacity, copy the block devices, and then working with the copy. sdc needs to be replaced anyway no matter what you do and getting a replacement for sda would be a good strategy anyway. Buy 2*4TB disks and you can make a new RAID-1 array that has more capacity than the non- RAID filesystem you currently have. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/