era_invalidate - Man Page

Provide a list of blocks that have changed since a particular era.


era_invalidate [options] {device|file}


era_invalidate examines era metadata and lists blocks that may have changed since a given era.

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


-h, ā€‰--help

Print help and exit.

-V, ā€‰--version

Print version information and exit.

-o {output file}

Write output to a file rather than stdout.


Use the metadata snapshot rather than the current superblock.

--written-since {era nr}

Blocks written since the given era will be listed.


List the blocks that may have been written since the beginning of era 13 on the metadata device /dev/vg/metadata:

    $ era_invalidate --written-since 13 /dev/vg/metadata

The device may not be actively used by the target when running.


era_invalidate returns an exit code of 0 for success or 1 for error (eg, metadata corruption).

See Also

era_check(8), era_dump(8), era_restore(8)


Joe Thornber <>

Referenced By

era_check(8), era_dump(8).

Device Mapper Tools System Manager's Manual