Btrfs devel - Oct 2010 - How can I recover data from little overwritten missing raid0 device?

I had set up btrfs with 2 devices by using command this command sequence.
"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 currently
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 restarted my
PC and try to mount both devices array again there was a message in dmesg 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  uuid: 5673597c-ff57-4a42-8fe3-ff793f476809
	Total devices 2 FS bytes used 706.75GB
	devid    1 size 930.00GB used 717.26GB path /dev/sda1
	*** 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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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 sequence.
> "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
currently
> 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 restarted
my
> PC and try to mount both devices array again there was a message in dmesg
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  uuid: 5673597c-ff57-4a42-8fe3-ff793f476809
>        Total devices 2 FS bytes used 706.75GB
>        devid    1 size 930.00GB used 717.26GB path /dev/sda1
>        *** 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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After a reboot you need to do

# btrfs device scan

in order to search all devices which may be involved in a multi devices setup 
(like RAID).

G.Baroncelli




On Sunday, 17 October, 2010, Chalet16 wrote:
> 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
sequence.
> > "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 
currently
> > 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
restarted
my
> > PC and try to mount both devices array again there was a message in
dmesg
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  uuid: 5673597c-ff57-4a42-8fe3-ff793f476809
> >        Total devices 2 FS bytes used 706.75GB
> >        devid    1 size 930.00GB used 717.26GB path /dev/sda1
> >        *** 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.
> >
> --
> To unsubscribe from this list: send the line "unsubscribe
linux-btrfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

-- 
gpg key@ keyserver.linux.it: Goffredo Baroncelli (ghigo)
<kreijack@inwind.it>
Key fingerprint = 4769 7E51 5293 D36C 814E  C054 BF04 F161 3DC5 0512
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It seem that another device doesn''t detect as btrfs filesystem
anymore.(I think
because its header had been overwritten.) That device is not appear when I run
"btrfs filesystem show".



On Sun, Oct 17, 2010 at 11:04 PM, Goffredo Baroncelli
<kreijack@libero.it> wrote:
> After a reboot you need to do
>
> # btrfs device scan
>
> in order to search all devices which may be involved in a multi devices
setup
> (like RAID).
>
> G.Baroncelli
>
>
>
>
> On Sunday, 17 October, 2010, Chalet16 wrote:
>> 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
sequence.
>> > "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
> currently
>> > 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
restarted
> my
>> > PC and try to mount both devices array again there was a message
in dmesg
> 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  uuid: 5673597c-ff57-4a42-8fe3-ff793f476809
>> >        Total devices 2 FS bytes used 706.75GB
>> >        devid    1 size 930.00GB used 717.26GB path /dev/sda1
>> >        *** 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.
>> >
>> --
>> To unsubscribe from this list: send the line "unsubscribe
linux-btrfs" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
>
>
> --
> gpg key@ keyserver.linux.it: Goffredo Baroncelli (ghigo)
<kreijack@inwind.it>
> Key fingerprint = 4769 7E51 5293 D36C 814E  C054 BF04 F161 3DC5 0512
>
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