NAME

       ndctl-read-labels - read out the label area on a dimm or set of dimms

SYNOPSIS

       ndctl read-labels <nmem0> [<nmem1>..<nmemN>] [<options>]

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. This command dumps the raw binary data in a dimm’s
       label area to stdout or a file. In the multi-dimm case the data is concatenated.

OPTIONS

       <memory device(s)>
           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).

       -I, --index
           Limit the span of the label operation to just the index-block area. This is useful to
           determine if the dimm label area is initialized. Note that this option and
           --size/--offset are mutually exclusive.

       -o, --output
           output file

       -j, --json
           parse the label data into json assuming the NVDIMM Namespace Specification format.

       -u, --human
           enable json output and convert number formats to human readable strings, for example
           show the size in terms of "KB", "MB", "GB", etc instead of a signed 64-bit numbers per
           the JSON interchange format (implies --json).

COPYRIGHT

       Copyright (c) 2016 - 2019, Intel Corporation. License GPLv2: GNU GPL version 2
       http://gnu.org/licenses/gpl.html. 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
       <http://www.uefi.org/sites/default/files/resources/UEFI_Spec_2_7.pdf>