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 (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 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.

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

AUTHOR
Joe Thornber <ejt@redhat.com>