1NVME-ID-NS(1) NVMe Manual NVME-ID-NS(1)
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6 nvme-id-ns - Send NVMe Identify Namespace, return result and structure
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9 nvme id-ns <device> [-v | --vendor-specific] [-b | --raw-binary]
10 [--namespace-id=<nsid> | -n <nsid>] [--force]
11 [--human-readable | -H]
12 [--output-format=<fmt> | -o <fmt>]
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15 For the NVMe device given, sends an identify namespace command and
16 provides the result and returned structure.
17 The <device> parameter is mandatory and may be either the NVMe
19 character device (ex: /dev/nvme0), or a namespace block device (ex:
20 /dev/nvme0n1). If the character device is given, the '--namespace-id'
21 option is mandatory, otherwise it will use the ns-id of the namespace
22 for the block device you opened. For block devices, the ns-id used can
23 be overridden with the same option.
24 On success, the structure may be returned in one of several ways
26 depending on the option flags; the structure may be parsed by the
27 program or the raw buffer may be printed to stdout.
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30 -n <nsid>, --namespace-id=<nsid>
31 Retrieve the identify namespace structure for the given nsid. This
32 is required for the character devices, or overrides the block nsid
33 if given. If the controller supports namespace management
34 capability and 0xFFFFFFFF is given, then the controller returns the
35 identify namespace structure that specifies common capabilities
36 across namespaces for the controller.
37 --force
39 Request controller return the identify namespace structure even if
40 the namespace is not attached to the controller. This is valid only
41 for controllers at or newer than revision 1.2. Controllers at
42 revision lower than this may interpret the command incorrectly.
43 -b, --raw-binary
45 Print the raw buffer to stdout. Structure is not parsed by program.
46 This overrides the vendor specific and human readable options.
47 -v, --vendor-specific
49 In addition to parsing known fields, this option will dump the
50 vendor specific region of the structure in hex with ascii
51 interpretation.
52 -H, --human-readable
54 This option will parse and format many of the bit fields into
55 human-readable formats.
56 -o <format>, --output-format=<format>
58 Set the reporting format to normal, json, or binary. Only one
59 output format can be used at a time.
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62 • Has the program interpret the returned buffer and display the known
63 fields in a human readable format:
64 # nvme id-ns /dev/nvme0n1
66 • If using the character device or overriding namespace id:
68 # nvme id-ns /dev/nvme0 -n 1
70 # nvme id-ns /dev/nvme0n1 -n 1
71 # nvme id-ns /dev/nvme0 --namespace-id=1
72 • In addition to showing the known fields, have the program to
74 display the vendor unique field:
75 # nvme id-ns /dev/nvme0n1 --vendor-specific
77 # nvme id-ns /dev/nvme0n1 -v
78 The above will dump the 'vs' buffer in hex since it doesn’t know
80 how to interpret it.
81 • Have the program return the raw structure in binary:
83 # nvme id-ns /dev/nvme0n1 --raw-binary > id_ns.raw
85 # nvme id-ns /dev/nvme0n1 -b > id_ns.raw
86 It is probably a bad idea to not redirect stdout when using this
88 mode.
89 • Alternatively you may want to send the data to another program that
91 can parse the raw buffer.
92 # nvme id-ns /dev/nvme0n1 --raw-binary | nvme_parse_id_ns
94 The parse program in the above example can be a program that shows
96 the structure in a way you like. The following program is such an
97 example that will parse it and can accept the output through a
98 pipe, '|', as shown in the above example, or you can 'cat' a saved
99 output buffer to it.
100 /* File: nvme_parse_id_ns.c */
102 #include <linux/nvme.h>
104 #include <stdio.h>
105 #include <unistd.h>
106 int main(int argc, char **argv)
108 {
109 unsigned char buf[sizeof(struct nvme_id_ns)];
110 struct nvme_id_ns *ns = (struct nvme_id_ns *)buf;
111 if (read(STDIN_FILENO, buf, sizeof(buf)))
113 return 1;
114 printf("nsze : %#llx\n", ns->nsze);
116 printf("ncap : %#llx\n", ns->ncap);
117 return 0;
118 }
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121 Part of the nvme-user suite
122NVMe 11/04/2022 NVME-ID-NS(1)