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

cache_repair - 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.

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

Joe Thornber <>, Heinz Mauelshagen <>
Device Mapper Tools System Manager's Manual