thin_dump

Section: Maintenance Commands (8)
Updated: Device Mapper Tools
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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.

AUTHOR

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