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 provision one, or more, namespaces from regions.
       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)>
           A nmemX device name, or a dimm id number. Restrict the operation to the specified
           dimm(s). The keyword all can be specified to indicate the lack of any restriction,
           however this is the same as not supplying a --dimm option at all.

       -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=
           A bus id number, or a provider string (e.g. "ACPI.NFIT"). Restrict the operation to
           the specified bus(es). The keyword all can be specified to indicate the lack of any
           restriction, however this is the same as not supplying a --bus option at all.

       -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 © 2016 - 2022, 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>