# ndctl−check−labels(1) [NAME](#name)\ [SYNOPSIS](#synopsis)\ [DESCRIPTION](#description)\ [OPTIONS](#options)\ [COPYRIGHT](#copyright)\ [SEE ALSO](#see-also) ## NAME ndctl−check−labels − determine if the given dimms have a valid namespace index block ## SYNOPSIS *ndctl check−labels* \ \[\..\] \[\] ## DESCRIPTION The namespace label area is a small persistent partition of capacity available on some NVDIMM devices. The label area is used to resolve aliasing between *pmem* and *blk* capacity by delineating namespace boundaries. In addition to checking if a label area has a valid index block, running this command in verbose mode reports the reason the index block is deemed invalid. ## OPTIONS `` One or more *nmemX* device names. The keyword *all* can be specified to operate on every dimm in the system, optionally filtered by bus id (see −−bus= option). `−s, −−size` Limit the operation to the given number of bytes. A size of 0 indicates to operate over the entire label capacity. `−O, −−offset` Begin the operation at the given offset into the label area. `−b, −−bus` Limit operation to memory devices (dimms) that are on the given bus. Where *bus* can be a provider name or a bus id number. `−v` Turn on verbose debug messages in the library (if ndctl was built with logging and debug enabled). ## COPYRIGHT Copyright (c) 2016 − 2019, Intel Corporation. License GPLv2: GNU GPL version 2 . This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. ## SEE ALSO *UEFI NVDIMM Label Protocol*