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

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.

Print help and exit.
Print version information and exit.
Suppress output messages, return only exit code.
Only check the superblock is present.

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.

era_dump(8), era_restore(8), era_invalidate(8)

Joe Thornber <>

Device Mapper Tools System Manager's Manual