Comment 0 for bug 1480923

lvm2 version 2.02.98-6ubuntu2

After doing a lvextend of a LVM Thin Pool, I had a corruption all sub
LVM Thin Volumes and lost all of them. Then tried to dump/repair the
tmeta and end up with empty thin volumes (no more filesystem signature on them).

To sum up
The thin_pool was 2T and I tried to increased it to 3T...

As fare as I know, none of the partitions were full but I increased the main
thin pool as it was close to the sum of all sub thin volumes.

I assume that using LVM Thin is still not stable on 14.04 LTS right?

I guess that lvm2 2.02.98 does not properly handle the metadata resize
of a thin pool right? (maybe add a warning somewhere in doc?)

I managed to recover some files from the raw thin_pool (tdata/tpool) with scalapel
but that is it.

Do you known any other tools to recovery lvm thin volumes or partition/data on it?

Errors

  attempt to access beyond end of device
  dm-6: rw=0, want=7753528, limit=262144
  attempt to access beyond end of device
  dm-6: rw=0, want=7753528, limit=262144
  attempt to access beyond end of device
  dm-6: rw=0, want=7753528, limit=262144
  attempt to access beyond end of device
  dm-6: rw=0, want=7753528, limit=262144

  /dev/mainvg/thin_rsnapshot: read failed after 0 of 4096 at 2199023190016: Input/output error
  /dev/mainvg/thin_rsnapshot: read failed after 0 of 4096 at 2199023247360: Input/output error
  /dev/mainvg/thin_rsnapshot: read failed after 0 of 4096 at 0: Input/output error
  /dev/mainvg/thin_rsnapshot: read failed after 0 of 4096 at 4096: Input/output error
  /dev/mainvg/thin_archive: read failed after 0 of 4096 at 805306302464: Input/output error
  /dev/mainvg/thin_archive: read failed after 0 of 4096 at 805306359808: Input/output error
  /dev/mainvg/thin_archive: read failed after 0 of 4096 at 0: Input/output error
  /dev/mainvg/thin_archive: read failed after 0 of 4096 at 4096: Input/output error

lvs
  LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert
  thin_archive mainvg Vwi-aotz- 500.00g thin_pool 94.65
  thin_rsnapshot mainvg Vwi-aotz- 1.50t thin_pool 94.01
  thin_pool mainvg twi-a-tz- 3.00t 71.65

lvresize -L 2T /dev/mapper/mainvg-thin_rsnapshot
  /dev/mainvg/thin_rsnapshot: read failed after 0 of 4096 at 1649267376128: Input/output error
  /dev/mainvg/thin_rsnapshot: read failed after 0 of 4096 at 1649267433472: Input/output error
  /dev/mainvg/thin_archive: read failed after 0 of 4096 at 536870846464: Input/output error
  /dev/mainvg/thin_archive: read failed after 0 of 4096 at 536870903808: Input/output error
  Extending logical volume thin_rsnapshot to 2.00 TiB
  Logical volume thin_rsnapshot successfully resized