From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:36609 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752369AbbEDVgq (ORCPT ); Mon, 4 May 2015 17:36:46 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1YpO2b-0000a9-7g for linux-btrfs@vger.kernel.org; Mon, 04 May 2015 23:36:41 +0200 Received: from c-24-5-205-109.hsd1.ca.comcast.net ([24.5.205.109]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 04 May 2015 23:36:41 +0200 Received: from obiwantje by c-24-5-205-109.hsd1.ca.comcast.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 04 May 2015 23:36:41 +0200 To: linux-btrfs@vger.kernel.org From: TheJay Subject: Re: [REQ] Help to gain access to btrfsraid6 pool that won't mount Date: Mon, 4 May 2015 21:36:35 +0000 (UTC) Message-ID: References: <5547E3BF.4090901@inwind.it> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Mon, 04 May 2015 23:25:19 +0200, Goffredo Baroncelli wrote: > A disk is missing, in this case you should use the "degraded" mount option: > > mount -o degraded /dev/sdaa /mnt/roms03 Goffredo - Thanks for responding - I tried that, but to no avail: $ sudo mount -o degraded /dev/sdaa /mnt/roms03 mount: wrong fs type, bad option, bad superblock on /dev/sdaa, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so $ dmesg -T|tail [Mon May 4 14:33:17 2015] BTRFS info (device sdaa): allowing degraded mounts [Mon May 4 14:33:17 2015] BTRFS info (device sdaa): disk space caching is enabled [Mon May 4 14:33:17 2015] BTRFS: has skinny extents [Mon May 4 14:33:17 2015] BTRFS: bdev (null) errs: wr 3, rd 28773, flush 2, corrupt 0, gen 0 [Mon May 4 14:33:22 2015] BTRFS (device sdaa): bad tree block start 8714499618262386624 1585233920 [Mon May 4 14:33:22 2015] BTRFS (device sdaa): bad tree block start 8714499618262386624 1585233920 [Mon May 4 14:33:22 2015] BTRFS (device sdaa): bad tree block start 8714499618262386624 1585233920 [Mon May 4 14:33:22 2015] BTRFS (device sdaa): bad tree block start 8714499618262386624 1585233920 [Mon May 4 14:33:22 2015] BTRFS: Failed to read block groups: -5 [Mon May 4 14:33:22 2015] BTRFS: open_ctree failed