In an approach for establishing metadata for one or more primary devices in a mirroring relationship, one or more computers systems generate a device validity token and establish a mirroring relationship, wherein the mirroring relationship includes identifying one or more primary devices of a plurality of devices in the mirroring relationship. The approach includes the computer systems sending the device validity token to each of a plurality of operating systems in the mirroring relationship for storage in a token store and retrieving a logical device identifier for each of the devices in the mirroring relationship. Furthermore, the approach includes the computer systems generating metadata for each of the primary devices, wherein metadata for each of the one or more primary devices includes at least the device validity token and the logical device identifier for each primary device of the one or more primary devices that generates the metadata.