cache_writeback - writeback dirty blocks to the origin device.

       Joe Thornber <ejt@redhat.com>

System Manager's Manual                        Device Mapper Tools                            cache_writeback(8)

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.

cache_writeback - writeback dirty blocks to the origin device.

-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 written 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 data cache, in megabytes.

           Defaults to 64 MiB, a larger size may improve performance.

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

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

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