cache_repair - Man Page

repair cache binary metadata from device/file to device/file.


cache_repair [options] -i {device|file} -o {device|file}


cache_repair reads binary cache metadata created by the respective device-mapper target from one device or file, repairs it and writes it to another device or file. If written to a metadata device, the metadata can be processed by the device-mapper target.

This tool cannot be run on live metadata.


-h,  --help

Print help and exit.

-V,  --version

Print version information and exit.

-i,  --input {device|file}

Input file or device containing binary metadata.

-o,  --output {device|file}

Output file or device for repaired binary metadata.

    If a file is then it must be preallocated, and large enough to hold the


Reads the binary cache metadata from file metadata, repairs it and writes it to logical volume /dev/vg/metadata for further processing by the respective device-mapper target:

    $ cache_repair -i metadata -o /dev/vg/metadata


cache_repair returns an exit code of 0 for success or 1 for error.

See Also

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


Joe Thornber <>, Heinz Mauelshagen <>

Referenced By

cache_check(8), cache_dump(8), cache_metadata_size(8), cache_restore(8), cache_writeback(8), lvconvert(8), lvmcache(7).

Device Mapper Tools System Manager's Manual