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.

-f, --format {xml|human_readable|custom}.

Print output in XML or human readable 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#].
Dump metadata snapshot created by device-mapper thin provisioning target. If block is not provided, access the default metadata snapshot created by the thin provisioning device-mapper target, else try the one at block#. 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 <dev-id>.
Dump the specified device. This option may be specified multiple times to select more than one thin device.

--skip-mappings.
Do not dump the mappings.

-h, --help.
Print help and exit.

-V, --version.
Output version information and exit.

 

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 [at] redhat.com>
Heinz Mauelshagen <HeinzM [at] RedHat.com>