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era_invalidate(8)           System Manager's Manual          era_invalidate(8)
NAME
       era_invalidate  -  Provide  a  list of blocks that have changed since a
       particular era.
SYNOPSIS
       era_invalidate [options] {device|file}
DESCRIPTION
       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.
OPTIONS
       -h, --help
              Print help and exit.
       -V, --version
              Print version information and exit.
       -o {output file}
              Write output to a file rather than stdout.
       --metadata-snapshot
              Use the metadata snapshot rather than the current superblock.
       --written-since {era nr}
              Blocks written since the given era will be listed.
EXAMPLE
       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.
DIAGNOSTICS
       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)
AUTHOR
       Joe Thornber <ejt AT redhat.com>
System Manager's Manual       Device Mapper Tools            era_invalidate(8)