nvme-ns-descs(1)

# nvme-ns-descs(1) Manual Page

## NAME

nvme-ns-descs - Send NVMe Identify for a list of Namespace Identification Descriptor structure, return result and structure

## SYNOPSIS

    nvme ns-descs <device> [--namespace-id=<nsid> | -n <nsid>]
                            [--raw-binary | -b]
                            [--output-format=<fmt> | -o <fmt>]

## DESCRIPTION

For the NVMe device given, sends an identify for a list of namespace identification descriptor structures command and provides the result and returned structure.

The <device> parameter is mandatory and may be either the NVMe character device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1). If the character device is given, the `'--namespace-id'` option is mandatory, otherwise it will use the ns-id of the namespace for the block device you opened. For block devices, the ns-id used can be overridden with the same option.

On success, the structure may be returned in one of several ways depending on the option flags; the structure may be parsed by the program or the raw buffer may be printed to stdout.

## OPTIONS

-n <nsid>
--namespace-id=<nsid>

  Retrieve the identify namespace identification descriptor structure for the given nsid. This is required for the character devices, or overrides the block nsid if given.

-b
--raw-binary

  Print the raw buffer to stdout. Structure is not parsed by program.

-o <format>
--output-format=<format>

  Set the reporting format to normal, json, or binary. Only one output format can be used at a time.

## EXAMPLES

- If using the character device or overriding namespace #2:

      # nvme ns-descs /dev/nvme0 -n 1
      # nvme ns-descs /dev/nvme0n1 -n 2
      # nvme ns-descs /dev/nvme0 --namespace-id=1

- Have the program return the raw structure in binary:

      # nvme ns-descs /dev/nvme0n1 --raw-binary > ns_descs.raw
      # nvme ns-descs /dev/nvme0n1 -b > ns_descs.raw

  It is probably a bad idea to not redirect stdout when using this mode.

## NVME

Part of the nvme-user suite