From: Chalet16 <chalet16@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: Re: How can I recover data from little overwritten missing raid0 device?
Date: Sun, 17 Oct 2010 22:24:27 +0700 [thread overview]
Message-ID: <AANLkTi=SLr_6E=Dwt5SmLp7_b4BGRMka0uXo=8qQp6Kf@mail.gmail.com> (raw)
In-Reply-To: <AANLkTinbmFFNySV=_vmWZzQWeLxL3wgBUmsuKch7Mn6j@mail.gmail.com>
UPDATE: I'm currently able to see and read/write some file in degraded=
mode
but there're many file i can't read with input/output error too.
On Sun, Oct 17, 2010 at 9:57 PM, Chalet16 <chalet16@gmail.com> wrote:
> I had set up btrfs with 2 devices by using command this command seque=
nce.
> "mkfs.btrfs -m raid1 /dev/sda1
> mount /dev/sda1 /mnt/data
> btrfs-vol -a /dev/sdb1 /mnt/data
> btrfs-vol -b /mnt/data"
>
> (I was think that it will do raid1 for both data and metadata but I c=
urrently
> realised that it will do raid1 for metadata but raid0 for data.)
>
> But I forgot that I have mount /dev/sdb1 with TrueCrypt. After I rest=
arted my
> PC and try to mount both devices array again there was a message in d=
mesg said
> "chalet16@server:~$ sudo mount /dev/sda1 /mnt/data
> [ 2828.921406] device label btr2902 devid 1 transid 8829 /dev/mapper/=
truecrypt1
> [ 2828.931780] btrfs: failed to read the system array on dm-1
> [ 2828.961330] btrfs: open_ctree failed"
>
> And when I ran btrfs-show it show that
> "chalet16@server:~$ sudo btrfs-show
> failed to read /dev/sr0
> Label: btr2902 =C2=A0uuid: 5673597c-ff57-4a42-8fe3-ff793f476809
> =C2=A0 =C2=A0 =C2=A0 =C2=A0Total devices 2 FS bytes used 706.75GB
> =C2=A0 =C2=A0 =C2=A0 =C2=A0devid =C2=A0 =C2=A01 size 930.00GB used 71=
7.26GB path /dev/sda1
> =C2=A0 =C2=A0 =C2=A0 =C2=A0*** Some devices missing
> Btrfs Btrfs v0.19"
> And when I run btrfsck on missing device
> "chalet16@server:~$ sudo btrfsck /dev/sde1
> No valid Btrfs found on /dev/sde1"
>
> So I would like to ask for help to recover data from this btrfs raid =
array. In
> my opinion I think that TrueCrypt only overwrite a little location in=
device
> because I haven't done anything with TrueCrypt device after that.
>
> Thanks
> Chalet16
>
>
> PS. I have recently known that TrueCrypt is in "Forbidden items" list=
in Fedora
> wiki, but this is not really related to TrueCrypt so please don't ban=
me because
> I had used TrueCrypt.
>
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next prev parent reply other threads:[~2010-10-17 15:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-17 14:57 How can I recover data from little overwritten missing raid0 device? Chalet16
2010-10-17 15:24 ` Chalet16 [this message]
2010-10-17 16:04 ` Goffredo Baroncelli
2010-10-17 16:09 ` Chalet16
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