35 lines
1.2 KiB
Plaintext
35 lines
1.2 KiB
Plaintext
NAME
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cache_writeback - writeback dirty blocks to the origin device.
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SYNOPSIS
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cache_writeback [options] --metadata-device {device|file} --origin-device {device|file} --fast-device {device|file}
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DESCRIPTION
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cache_writeback is an offline tool that writes back dirty data to the data
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device (origin). Intended for use in recovery scenarios when the SSD is
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giving IO errors.
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This tool cannot be run on a live cache.
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OPTIONS
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-h, --help Print help and exit.
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-V, --version Print version information and exit.
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--metadata-device {device|file} Location of cache metadata.
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--origin-device {device|file} Slow device being cached.
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--fast-device {device|file} Fast device containing the data that needs to be written back.
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--no-metadata-update Do not update the metadata to clear the dirty flags.
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You may want to use this flag if you're decommissioning the cache.
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--buffer-size-meg {size} Specify the size for the metadata cache.
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Defaults to 16 Gig, a larger size may improve performance.
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--list-failed-blocks List any blocks that failed the writeback process.
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SEE ALSO
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cache_dump(8), cache_check(8), cache_repair(8), cache_restore(8)
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AUTHOR
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Joe Thornber <ejt@redhat.com>
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