cache_writeback(8) - phpMan

cache_writeback(8)                   System Manager's Manual                   cache_writeback(8)

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 (ori-
       gin). 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 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 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 AT redhat.com>

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

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