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/metadataDumps the thin provisioning metadata on logical volume /dev/vg/metadata to standard output in XML format:
$ thin_dump /dev/vg/metadataDumps 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)