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nvme-id-ns - Online in the Cloud

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This is the command nvme-id-ns that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


nvme-id-ns - Send NVMe Identify Namespace, return result and structure

SYNOPSIS


nvme id-ns <device> [-v | --vendor-specific] [-b | --raw-binary]
[--namespace-id=<nsid> | -n <nsid>]

DESCRIPTION


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.

OPTIONS


-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.

-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.

EXAMPLES


· Has the program interpret the returned buffer and display the known fields in a human
readable format:

# nvme id-ns /dev/nvme0n1

· If using the character device or overriding namespace id:

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

· In addition to showing the known fields, have the program to display the vendor unique
field:

# nvme id-ns /dev/nvme0n1 --vendor-specific
# nvme id-ns /dev/nvme0n1 -v

The above will dump the 'vs' buffer in hex since it doesn’t know how to interpret it.

· Have the program return the raw structure in binary:

# nvme id-ns /dev/nvme0n1 --raw-binary > id_ns.raw
# nvme id-ns /dev/nvme0n1 -b > id_ns.raw

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

· Alternatively you may want to send the data to another program that can parse the raw
buffer.

# nvme id-ns /dev/nvme0n1 --raw-binary | nvme_parse_id_ns

The parse program in the above example can be a program that shows the structure in a
way you like. The following program is such an example that will parse it and can
accept the output through a pipe, '|', as shown in the above example, or you can 'cat'
a saved output buffer to it.

/* 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;
}

NVME


Part of the nvme-user suite

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