[linux-lvm] LVM Thin - bad checksum in superblock - cannot perform operations on metadata

[pavel olenev]

Hello.
I am looking for advice on how to act in such a situation. Perhaps anyone
has gone through something similar?
We used lvm thin provisioning on one of our arrays. But after raid
controller failure we got problem with activation of all thin volumes:

# lvchange -a y data/thin
  Check of pool data/thin failed (status:1). Manual repair required!

I tried to use lvconvert --repair data/thin, but have this:

# lvconvert --repair data/thin
truncating metadata device to 4161600 4k blocks
bad checksum in superblock, wanted 1494954599
  Repair of thin metadata volume of thin pool data/thin failed (status:1).
Manual repair required!

I have seen recipes related to thin_dump but I cannot use them, since in
particular thin_dump works with a mounted device. Аnd I, due to a faulty
superblock, cannot achieve the presence of the LVM partitions in
/dev/mapper/ for working such a device

Are there any chances of a successful recovery? And what can be done in
such a situation?

Best regards,
Pavel

P.S. And some output:

# pvscan
  PV /dev/sdc1   VG data            lvm2 [<10.90 TiB / <4.87 TiB free]

# vgs
  VG   #PV #LV #SN Attr   VSize    VFree
  data   1  11   0 wz--n-  <10.90t <4.87t

# lvs -a
  LV              VG   Attr       LSize   Pool Origin Data%  Meta%  Move
Log Cpy%Sync Convert
  [lvol0_pmspare] data ewi-------  16.00g
  thin            data twi---tz--   6.00t
  [thin_tdata]    data Twi-------   6.00t
  [thin_tmeta]    data ewi-------  16.00g
  vm-105-disk-0   data Vwi---tz--  40.00g thin
  vm-105-disk-1   data Vwi---tz-- 500.00g thin
  vm-107-disk-1   data Vwi---tz--  40.00g thin
  vm-107-disk-2   data Vwi---tz--  40.00g thin
  vm-107-disk-3   data Vwi---tz-- 500.00g thin
  vm-123-disk-0   data Vwi---tz--  32.00g thin
  vm-148-disk-0   data Vwi---tz--   1.17t thin
  vm-161-disk-0   data Vwi---tz--  32.00g thin
  vm-166-disk-0   data Vwi---tz--  32.00g thin
  vm-168-disk-0   data Vwi---tz--  50.00g thin

# lvscan -a
File descriptor 7 (pipe:[224496]) leaked on lvscan invocation. Parent PID
24064: bash
  inactive          '/dev/data/thin' [6.00 TiB] inherit
  inactive          '/dev/data/vm-107-disk-1' [40.00 GiB] inherit
  inactive          '/dev/data/vm-107-disk-2' [40.00 GiB] inherit
  inactive          '/dev/data/vm-107-disk-3' [500.00 GiB] inherit
  inactive          '/dev/data/vm-105-disk-0' [40.00 GiB] inherit
  inactive          '/dev/data/vm-105-disk-1' [500.00 GiB] inherit
  inactive          '/dev/data/vm-148-disk-0' [1.17 TiB] inherit
  inactive          '/dev/data/vm-161-disk-0' [32.00 GiB] inherit
  inactive          '/dev/data/vm-166-disk-0' [32.00 GiB] inherit
  inactive          '/dev/data/vm-123-disk-0' [32.00 GiB] inherit
  inactive          '/dev/data/vm-168-disk-0' [50.00 GiB] inherit
  inactive          '/dev/data/lvol0_pmspare' [16.00 GiB] inherit
  inactive          '/dev/data/thin_tmeta' [16.00 GiB] inherit
  inactive          '/dev/data/thin_tdata' [6.00 TiB] inherit
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