# Text automatically generated by txt2man

     NAME
          cache_writeback - writeback dirty blocks to the origin
          device.

     SYNOPSIS
          cache_writeback [options] --metadata-device {device|file} --origin-device {device|file} --fast-device {device|file}

     DESCRIPTION
          cache_writeback is an offline tool that writes back dirty
          data to the data device (origin). Intended for use in
          recovery scenarios when the SSD is giving IO errors.

          This tool cannot be run on a live cache.

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

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

          --metadata-device {device|file}
               Location of cache metadata.

          --origin-device {device|file}
               Slow device being cached.

          --fast-device {device|file}
               Fast device containing the data that needs to be writ-
               ten back.

          --no-metadata-update
               Do not update the metadata to clear the dirty flags.

              You may want to use this flag if you're decommissioning the cache.

          --buffer-size-meg {size}
               Specify the size for the metadata cache.

              Defaults to 16 Gig, a larger size may improve performance.

          --list-failed-blocks
               List any blocks that failed the writeback process.

     SEE ALSO
          cache_dump(8), cache_check(8), cache_repair(8),
          cache_restore(8)

     AUTHOR
          Joe Thornber <ejt@redhat.com>

     Page 1               System Manager's Manual    (printed 5/25/22)