NAME
  thin_dump - dump thin provisioning metadata from device or file to standard output.

SYNOPSIS
  thin_dump [options] {device|file}

DESCRIPTION
  thin_dump dumps binary thin provisioning metadata (optionally from alternate
  block; see option --metadata-snap) created by the
  device-mapper thin provisioning target on a device or file to standard
  output for analysis or postprocessing in either XML or human readable format.
  XML formated metadata can be fed into thin_restore (see thin_restore(8))
  in order to put it back onto a metadata device (to process by the
  device-mapper target) or file.

  This tool cannot be run on live metadata unless the --metadata-snap
  option is used.

OPTIONS
  -h, --help		Print help and exit.
  -V, --version		Print version information and exit.
  -f, --format {xml|human_readable|custom}	Choose output format.

    Custom formats are supported via shared library plugins.  They should be
    specified as in this example:

      $ thin_dump --format custom=mylib.so /dev/sda

  -r, --repair		Repair the metadata whilst dumping it.
  -m, --metadata-snap{=<block nr>}	Dump metadata snapshot.

    If block is not provided, access the default metadata snapshot created by
    the thin provisioning device-mapper target, else try the one at block nr.
    See the thin provisioning target documentation on how to create or release
    a metadata snapshot and retrieve the block number from the kernel.

  --dev-id {natural}	Dump the specified device.

    This option may be specified multiple times to select more than one thin
    device.

  --transaction-id {natural}	Override the transaction id given in the input xml.
  --data-block-size {natural}	Override the data block size given in the input xml.
  --nr-data-blocks {natural}    Override the nr data blocks given in the input xml.

  --skip-mappings	Do not dump the mappings.
  -o {xml file}		Specify a file for the output rather than writing to stdout.

EXAMPLES
  Dumps the thin provisioning metadata on logical volume /dev/vg/metadata to
  standard output in human readable format:

    $ thin_dump -f human_readable /dev/vg/metadata

  Dumps the thin provisioning metadata on logical volume /dev/vg/metadata to
  standard output in XML format:

    $ thin_dump /dev/vg/metadata

  Dumps the thin provisioning metadata snapshot on logical volume /dev/vg/metadata
  to standard output in human readable format (not processable by thin_restore(8)):

    $ thin_dump --format human_readable --metadata-snap /dev/vg/metadata

DIAGNOSTICS
  thin_dump returns an exit code of 0 for success or 1 for error.

SEE ALSO
  thin_check(8), thin_repair(8), thin_restore(8), thin_rmap(8), thin_metadata_size(8)

AUTHOR
  Joe Thornber <ejt@redhat.com>, Heinz Mauelshagen <HeinzM@RedHat.com>