1cache_writeback(8)          System Manager's Manual         cache_writeback(8)
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NAME

6       cache_writeback - writeback dirty blocks to the origin device.
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SYNOPSIS

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

12       cache_writeback  is  an offline tool that writes back dirty data to the
13       data device (origin). Intended for use in recovery scenarios  when  the
14       SSD is giving IO errors.
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16       This tool cannot be run on a live cache.
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OPTIONS

19       -h, --help
20              Print help and exit.
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22       -V, --version
23              Print version information and exit.
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25       --metadata-device {device|file}
26              Location of cache metadata.
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28       --origin-device {device|file}
29              Slow device being cached.
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31       --fast-device {device|file}
32              Fast device containing the data that needs to be written back.
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34       --no-metadata-update
35              Do not update the metadata to clear the dirty flags.
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37           You may want to use this flag if you're decommissioning the cache.
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40       --buffer-size-meg {size}
41              Specify the size for the metadata cache.
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43           Defaults to 16 Gig, a larger size may improve performance.
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46       --list-failed-blocks
47              List any blocks that failed the writeback process.
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SEE ALSO

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

53       Joe Thornber <ejt@redhat.com>
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57System Manager's Manual       Device Mapper Tools           cache_writeback(8)
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