More information: It looks like the pvscan output I quoted below was actually capturing the original half-dead device, not the image added by kpartx. After I turned off the USB disk enclosure I get:
# losetup -a /dev/loop0: [0821]:132 (/media/FreeAgent Drive/AMOS/sdd) # pvscan /dev/pictonvg/swaplv: read failed after 0 of 4096 at 536805376: Input/output error /dev/pictonvg/swaplv: read failed after 0 of 4096 at 0: Input/output error /dev/pictonvg/rootlv: read failed after 0 of 4096 at 10737352704: Input/output error /dev/pictonvg/rootlv: read failed after 0 of 4096 at 0: Input/output error /dev/pictonvg/homelv: read failed after 0 of 4096 at 88747212800: Input/output error /dev/pictonvg/homelv: read failed after 0 of 4096 at 0: Input/output error PV /dev/sda5 VG wanaka lvm2 [278.47 GB / 7.97 GB free] Total: 1 [278.47 GB] / in use: 1 [278.47 GB] / in no VG: 0 [0 ] I.e. nothing is recognized from the loop-loaded image file. Help? --Amos 2009/1/2 Amos Shapira <amos.shap...@gmail.com>: > Hello, > > I'm trying to salvage data from a desktop IDE disk which went sour > during a Windows XP re-installation on one of its partitions (the rest > was Ubunut 8.04 with LVM). > > I put that IDE disk into an IDE->USB enclosure and ran ddrescue on it. > It complaint a lot but for now I just want to see if I manage to read > whatever is possible at the LVM level. > > "fdisk -l" on the image file complains about not finding geometry and > therefore difference in logical/physical partition size in table: > > Disk sdd: 0 MB, 0 bytes > 255 heads, 63 sectors/track, 0 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > Disk identifier: 0x00096ee7 > > Device Boot Start End Blocks Id System > sdd2 12030 24190 97683232+ 8e Linux LVM > Partition 2 has different physical/logical beginnings (non-Linux?): > phys=(1023, 0, 1) logical=(12029, 0, 1) > Partition 2 has different physical/logical endings: > phys=(1023, 254, 63) logical=(24189, 254, 63) > sdd3 24191 24321 1052257+ 83 Linux > Partition 3 has different physical/logical beginnings (non-Linux?): > phys=(1023, 0, 1) logical=(24190, 0, 1) > Partition 3 has different physical/logical endings: > phys=(1023, 254, 63) logical=(24320, 254, 63) > > If I give it a "number of cylinders" it doesn't complain: > > fdisk -C 24321 -l sdd > > Disk sdd: 0 MB, 0 bytes > 255 heads, 63 sectors/track, 24321 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > Disk identifier: 0x00096ee7 > > Device Boot Start End Blocks Id System > sdd2 12030 24190 97683232+ 8e Linux LVM > sdd3 24191 24321 1052257+ 83 Linux > > (I deleted the windows partition on the image file). > > But kpartx/pvscan still complains a lot when I try to add this image: > > # kpartx -a -v "`pwd`/sdd" > gpt: 0 slices > dos: 4 slices > device-mapper: reload ioctl failed: Invalid argument > add map loop0p2 (0:0): 0 195366465 linear /dev/loop0 193245885 > device-mapper: reload ioctl failed: Invalid argument > add map loop0p3 (0:0): 0 2104515 linear /dev/loop0 388612350 > # pvscan > /dev/pictonvg/swaplv: read failed after 0 of 4096 at 536805376: > Input/output error > /dev/pictonvg/swaplv: read failed after 0 of 4096 at 0: Input/output error > /dev/pictonvg/rootlv: read failed after 0 of 4096 at 10737352704: > Input/output error > /dev/pictonvg/rootlv: read failed after 0 of 4096 at 0: Input/output error > /dev/pictonvg/homelv: read failed after 0 of 4096 at 88747212800: > Input/output error > /dev/pictonvg/homelv: read failed after 0 of 4096 at 0: Input/output error > /dev/sdd1: read failed after 0 of 2048 at 0: Input/output error > PV /dev/sdd2 VG pictonvg lvm2 [93.16 GB / 4.00 MB free] > PV /dev/sda5 VG wanaka lvm2 [278.47 GB / 7.97 GB free] > Total: 2 [371.62 GB] / in use: 2 [371.62 GB] / in no VG: 0 [0 ] > > And I can't access these volumes: > > # e2fsck /dev/pictonvg/homelv > e2fsck 1.40.8 (13-Mar-2008) > e2fsck: Attempt to read block from filesystem resulted in short read > while trying to open /dev/pictonvg/homelv > Could this be a zero-length partition? > > What can I do in order to access the volumes on the image file? > > Thanks, > > --Amos > ================================================================= To unsubscribe, send mail to linux-il-requ...@cs.huji.ac.il with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail linux-il-requ...@cs.huji.ac.il
