From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chalet16 Subject: Re: How can I recover data from little overwritten missing raid0 device? Date: Sun, 17 Oct 2010 23:09:48 +0700 Message-ID: References: <201010171804.59034.kreijack@libero.it> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Cc: linux-btrfs@vger.kernel.org To: kreijack@libero.it Return-path: In-Reply-To: <201010171804.59034.kreijack@libero.it> List-ID: 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 whe= n I run "btrfs filesystem show". On Sun, Oct 17, 2010 at 11:04 PM, Goffredo Baroncelli wrote: > After a reboot you need to do > > # btrfs device scan > > in order to search all devices which may be involved in a multi devic= es setup > (like RAID). > > G.Baroncelli > > > > > On Sunday, 17 October, 2010, Chalet16 wrote: >> UPDATE: I'm currently =C2=A0able 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 wrote= : >> > I had set up btrfs with 2 devices by using command this command se= quence. >> > "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 r= estarted > my >> > PC and try to mount both devices array again there was a message i= n 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 =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= 717.26GB 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 ra= id > 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" l= ist 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-btrf= s" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at =C2=A0http://vger.kernel.org/majordomo-info.h= tml >> > > > -- > gpg key@ keyserver.linux.it: Goffredo Baroncelli (ghigo) > Key fingerprint =3D 4769 7E51 5293 D36C 814E =C2=A0C054 BF04 F161 3DC= 5 0512 > -- 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