era_check man page

era_check — validate era metadata on device or file


era_check [options] {device|file}


era_check checks era metadata created by the device-mapper era target on a device or file.

This tool cannot be run on live metadata.


-q, --quiet

Suppress output messages, return only exit code.

-h, --help

Print help and exit.

-V, --version

Output version information and exit.


Only check the superblock is present.

era_check will return a non-zero exit code if it finds a fatal error.  If any errors are discovered use era_repair to correct.


Analyse thin provisioning metadata on logical volume /dev/vg/metadata:

era_check /dev/vg/metadata

The device may not be actively used by the target when running.


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

See Also

era_dump(8) era_repair(8) era_restore(8) era_invalidate(8)


Joe Thornber <>

Referenced By

era_dump(8), era_invalidate(8).

Thin Provisioning Tools Red Hat, Inc.