From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:33812 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752667AbbEEH2y (ORCPT ); Tue, 5 May 2015 03:28:54 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1YpXHg-0006gs-Ha for linux-btrfs@vger.kernel.org; Tue, 05 May 2015 09:28:52 +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 ; Tue, 05 May 2015 09:28:52 +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 ; Tue, 05 May 2015 09:28:52 +0200 To: linux-btrfs@vger.kernel.org From: TheJay Subject: Re: [REQ] Help to gain access to btrfsraid6 pool that won't mount Date: Tue, 5 May 2015 07:28:46 +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 Tue, 05 May 2015 00:52:16 -0600, Chris Murphy wrote: > On Mon, May 4, 2015 at 3:36 PM, TheJay wrote: > >> [Mon May 4 14:33:17 2015] BTRFS: bdev (null) errs: wr 3, rd 28773, flush 2, corrupt 0, gen 0 > > So there might be more than one thing going wrong and they're > colliding to make a worse problem. You've got three write and 2 flush > errors, and many thousands of read errors (probably due to missing > devices). > > It might be worth trying -o degraded,recovery because recovery can't > work with devices missing, and degraded alone won't run the recovery > code. > > > -- > Chris Murphy $ mount -o degraded,recovery /dev/sdz /mnt/roms03 mount: wrong fs type, bad option, bad superblock on /dev/sdy, 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 [Tue May 5 00:26:01 2015] BTRFS info (device sdaa): enabling auto recovery [Tue May 5 00:26:01 2015] BTRFS info (device sdaa): disk space caching is enabled [Tue May 5 00:26:01 2015] BTRFS: has skinny extents [Tue May 5 00:26:01 2015] BTRFS: bdev (null) errs: wr 3, rd 28773, flush 2, corrupt 0, gen 0 [Tue May 5 00:26:05 2015] BTRFS (device sdaa): bad tree block start 8714499618262386624 1585233920 [Tue May 5 00:26:05 2015] BTRFS (device sdaa): bad tree block start 8714499618262386624 1585233920 [Tue May 5 00:26:05 2015] BTRFS (device sdaa): bad tree block start 8714499618262386624 1585233920 [Tue May 5 00:26:05 2015] BTRFS (device sdaa): bad tree block start 8714499618262386624 1585233920 [Tue May 5 00:26:05 2015] BTRFS: Failed to read block groups: -5 [Tue May 5 00:26:06 2015] BTRFS: open_ctree failed