nvme-ns-descs - Man Page

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

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​.

-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 <fmt>, --output-format=<fmt>

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

-v,  --verbose

Increase the information detail in the output​.

• 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​.

Part of the nvme-user suite

nvme(1).