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nvme-id-ns - Man Page

Send NVMe Identify Namespace, return result and structure


nvme id-ns <device> [--vendor-specific | -v] [--raw-binary | -b]
                        [--namespace-id=<nsid> | -n <nsid>] [--force]
                        [--human-readable | -H]
                        [--output-format=<fmt> | -o <fmt>] [--verbose | -v]


For the NVMe device given, sends an identify namespace 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 structure for the given nsid. This is required for the character devices, or overrides the block nsid if given. If the controller supports namespace management capability and 0xFFFFFFFF is given, then the controller returns the identify namespace structure that specifies common capabilities across namespaces for the controller.


Request controller return the identify namespace structure even if the namespace is not attached to the controller. This is valid only for controllers at or newer than revision 1.2. Controllers at revision lower than this may interpret the command incorrectly.

-b,  --raw-binary

Print the raw buffer to stdout. Structure is not parsed by program. This overrides the vendor specific and human readable options.

-V,  --vendor-specific

In addition to parsing known fields, this option will dump the vendor specific region of the structure in hex with ascii interpretation.

-H,  --human-readable

This option will parse and format many of the bit fields into human-readable formats.

-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.


/* File: nvme_parse_id_ns.c */

#include <linux/nvme.h>
#include <stdio.h>
#include <unistd.h>

int main(int argc, char **argv)
        unsigned char buf[sizeof(struct nvme_id_ns)];
        struct nvme_id_ns *ns = (struct nvme_id_ns *)buf;

        if (read(STDIN_FILENO, buf, sizeof(buf)))
                return 1;

        printf("nsze : %#llx\n", ns->nsze);
        printf("ncap : %#llx\n", ns->ncap);
        return 0;


Part of the nvme-user suite

Referenced By


06/03/2024 NVMe Manual