From: Goffredo Baroncelli <kreijack@inwind.it>
To: TheJay <obiwantje@gmail.com>, linux-btrfs@vger.kernel.org
Subject: Re: [REQ] Help to gain access to btrfsraid6 pool that won't mount
Date: Mon, 04 May 2015 23:25:19 +0200 [thread overview]
Message-ID: <5547E3BF.4090901@inwind.it> (raw)
In-Reply-To: <mi8452$i00$1@ger.gmane.org>
On 2015-05-04 17:44, TheJay wrote:
> $ uname -a
> Linux thejay-srv03 4.0.0-040000-generic #201504121935 SMP Sun Apr 12
> 23:36:33 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>
> $ btrfs --version
> btrfs-progs v3.19.1
>
> $ sudo btrfs fi show
> Label: 'roms03' uuid: b0025417-4045-4c63-a432-0625b7cc41ea
> Total devices 4 FS bytes used 2.67TiB
> devid 1 size 1.36TiB used 1.36TiB path /dev/sdz
> devid 3 size 1.36TiB used 1.36TiB path /dev/sdaa
> devid 4 size 1.36TiB used 1.36TiB path /dev/sdab
> *** Some devices missing
>
> This pool is a btrfsraid6 pool
>
> when trying to mount I get:
>
> $ sudo mount -t btrfs -o recovery,ro /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 08:35:08 2015] BTRFS info (device sdz): enabling auto recovery
> [Mon May 4 08:35:08 2015] BTRFS info (device sdz): disk space caching is
> enabled
> [Mon May 4 08:35:08 2015] BTRFS: has skinny extents
> [Mon May 4 08:35:08 2015] BTRFS: failed to read chunk tree on sdz
> [Mon May 4 08:35:08 2015] BTRFS: open_ctree failed
>
> What could I try to see if I can mount this pool and gain access to the
> data?
A disk is missing, in this case you should use the "degraded" mount option:
mount -o degraded /dev/sdaa /mnt/roms03
>
> While I have a backup of the data, next time I may not, and I am trying
> to learn how to go about.
>
>
> --
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>
--
gpg @keyserver.linux.it: Goffredo Baroncelli <kreijackATinwind.it>
Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5
next prev parent reply other threads:[~2015-05-04 21:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-04 15:44 [REQ] Help to gain access to btrfsraid6 pool that won't mount TheJay
2015-05-04 21:25 ` Goffredo Baroncelli [this message]
2015-05-04 21:36 ` TheJay
2015-05-05 6:52 ` Chris Murphy
2015-05-05 7:28 ` TheJay
2015-05-05 6:48 ` Chris Murphy
2015-05-05 7:30 ` TheJay
2015-05-06 11:55 ` Duncan
2015-05-06 16:45 ` TheJay
2015-05-06 17:47 ` TheJay
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