I am using Linux on my notebook. My notebook recently fall on ground and now I am trying to save as much data from my damaged hdd as possible. I can boot notebook from Linux live CD.
Long story short: one ext4 partition is not mountable, but I can try to repair it by fsck.ext4. I also can try to first try to recover bad blocks on hdd (probably by SpinRite). What sould I do first?
In full details:
Here is my drive:
# fdisk -l Disk /dev/sda: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000080 Device Boot Start End Blocks Id System /dev/sda1 * 1 3824 30716248+ 7 HPFS/NTFS /dev/sda2 3825 19449 125507812+ 83 Linux /dev/sda3 19450 19457 64260 83 Linux
Let' forget /dev/sda1 NTFS partition, not that important. Third partition /dev/sda3 is just /boot, not important either. Second /dev/sda2 is physical space for LVM (see bellow).
Logical group /dev/group1/arch is encrypted by dm-crypt LUKS, I am unable to open it and data there are probably lost. Logical groups /dev/group1/data and /dev/group1/data2 are ext4 volumes. I can mount /dev/group1/data2 (mount -t ext4 -o ro,noload /dev/group1/data2 /mnt/data2) and backup data on external drive. But I can not mount /dev/group1/data:
# mount -t ext4 -o ro,noload /dev/group1/data /x/data mount: wrong fs type, bad option, bad superblock on /dev/mapper/group1-data, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so
fsck does not work:
# fsck.ext4 -n /dev/group1/data e2fsck 1.41.11 (14-Mar-2010) fsck.ext4: Attempt to read block from filesystem resulted in short read while trying to open /dev/group1/data Could this be a zero-length partition?
dumpe2fs does not finds superblock either:
# dumpe2fs /dev/group1/data dumpe2fs 1.41.11 (14-Mar-2010) dumpe2fs: Attempt to read block from filesystem resulted in short read while trying to open /dev/group1/data Couldn't find valid filesystem superblock.
Only thing I can do is try to find where superblock usually is:
# mkfs.ext4 -n /dev/group1/data mke2fs 1.41.11 (14-Mar-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 5242880 inodes, 20971520 blocks 1048576 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=0 640 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000
...and start fsck using one of this superblocks:
# fsck.ext4 -n -b 229376 /dev/group1/data e2fsck 1.41.11 (14-Mar-2010) One or more block group descriptor checksums are invalid. Fix? no Group descriptor 0 checksum is invalid. IGNORED. Group descriptor 1 checksum is invalid. IGNORED. Group descriptor 2 checksum is invalid. IGNORED. Group descriptor 3 checksum is invalid. IGNORED. Group descriptor 4 checksum is invalid. IGNORED. Group descriptor 5 checksum is invalid. IGNORED. ... Group descriptor 637 checksum is invalid. IGNORED. Group descriptor 638 checksum is invalid. IGNORED. Group descriptor 639 checksum is invalid. IGNORED. /dev/group1/data contains a file system with errors, check forced. Resize inode not valid. Recreate? no Pass 1: Checking inodes, blocks, and sizes ...here I pressed Ctrl-C...
So - it displays a lots of errors, but it seems it will try to repair (if I use fsck.ext4 -y instead fsck.ext4 -n of course).
Other options - frind of mine has SpinRite 6 boot CD, which is told to be on of the best programs to repair bad blocks.
So my QUESTION is - should I
- try first SpinRite to repair bad blocks and then fsck.ext4 -y (or even better dump whole raw partitition to one big file on external hdd, make copy, mount copy as loopback and then try fckk.ext4 -y)
- try firt fsck.ext4 -y with hope than afterwards ome data will be readable, backup this data on external hdd (and then try eventually SpinRite) ?
- or do something else?
Thanks a lot for any hint.
# pvdisplay --- Physical volume --- PV Name /dev/sda2 VG Name group1 PV Size 119.69 GiB / not usable 2.22 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 30641 Free PE 0 Allocated PE 30641 PV UUID 0k3Zl5-Q7BD-rb8J-9jTZ-2uii-GSGd-B339JB # vgdisplay --- Volume group --- VG Name group1 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 10 VG Access read/write VG Status resizable MAX LV 0 Cur LV 4 Open LV 1 Max PV 0 Cur PV 1 Act PV 1 VG Size 119.69 GiB PE Size 4.00 MiB Total PE 30641 Alloc PE / Size 30641 / 119.69 GiB Free PE / Size 0 / 0 VG UUID kKhvri-OVpL-uhCP-T4an-qXIJ-4XL0-kn9Ifi # lvdisplay --- Logical volume --- LV Name /dev/group1/swap VG Name group1 LV UUID wpDink-01q0-peLc-29at-5kgP-YO3a-8bNrb7 LV Write Access read/write LV Status available # open 0 LV Size 1.50 GiB Current LE 384 Segments 1 Allocation contiguous Read ahead sectors auto - currently set to 256 Block device 252:0 --- Logical volume --- LV Name /dev/group1/arch VG Name group1 LV UUID S1TZkr-y62z-dOuc-D38G-nuCH-1ilc-y2jqMa LV Write Access read/write LV Status available # open 0 LV Size 15.00 GiB Current LE 3840 Segments 1 Allocation contiguous Read ahead sectors auto - currently set to 256 Block device 252:1 --- Logical volume --- LV Name /dev/group1/data VG Name group1 LV UUID 2R4LNv-sHPh-E7ES-goIF-5nUz-tQyj-GOiwvC LV Write Access read/write LV Status available # open 0 LV Size 80.00 GiB Current LE 20480 Segments 1 Allocation contiguous Read ahead sectors auto - currently set to 256 Block device 252:2 --- Logical volume --- LV Name /dev/group1/data2 VG Name group1 LV UUID 4VqpZj-uOBi-OAIZ-1IXA-G6mj-Qgfb-c6RYqw LV Write Access read/write LV Status available # open 1 LV Size 23.19 GiB Current LE 5937 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:3