'\" t
.\"     Title: nvme-id-nvm-ns
.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 09/07/2026
.\"    Manual: NVMe Manual
.\"    Source: NVMe
.\"  Language: English
.\"
.TH "NVME\-ID\-NVM\-NS" "1" "09/07/2026" "NVMe" "NVMe Manual"
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.SH "NAME"
nvme-id-nvm-ns \- Send NVMe Identify NVM Command Set specific Namespace data structure, display structure
.SH "SYNOPSIS"
.sp
.nf
\fInvme\fR [<global\-options>] \fIid nvm\-ns\fR <device>
                        [\-\-uuid\-index=<uuid\-index> | \-U <uuid_index>]
                        [\-\-namespace\-id=<NUM> | \-n <NUM>]
.fi
.SH "DESCRIPTION"
.sp
Identify NVM Command Set specific Namespace data structure for the specified NSID for the NVM Command Set specified in the CSI field\&.
.sp
The <device> parameter is mandatory and may be either the NVMe character device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1)\&.
.sp
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\&.
.SH "OPTIONS"
.PP
\-n <NUM>, \-\-namespace\-id=<NUM>
.RS 4
Use the provided namespace id for the command\&. If not provided, the namespace id of the block device will be used\&. If the command is issued to a non\-block device, the parameter is required\&.
.RE
.PP
\-U <uuid\-index>, \-\-uuid\-index=<uuid\-index>
.RS 4
UUID Index of the feature
.RE
.SH "GLOBAL OPTIONS"
.sp
The following options are defined at the top\-level nvme command and are available to this subcommand:
.PP
\-\-dry\-run
.RS 4
Print the command that would be executed, but do not actually execute it\&.
.RE
.PP
\-\-no\-ioctl\-probing
.RS 4
Disable probing for 64\-bit IOCTL support\&.
.RE
.PP
\-\-no\-retries
.RS 4
Disable retry logic on transient errors\&.
.RE
.PP
\-o <fmt>, \-\-output\-format=<fmt>
.RS 4
Set the reporting format to
\fInormal\fR,
\fItabular, \*(Aqjson\fR, or
\fIbinary\fR\&. Only one output format may be used at a time\&.
.RE
.PP
\-\-output\-format\-version=<version>
.RS 4
Select the output format version\&. Version
\fI1\fR
uses the original field naming, while version
\fI2\fR
(default) provides more consistent and script\-friendly field names\&.
.RE
.PP
\-\-timeout=<ms>
.RS 4
Set the timeout for the command in milliseconds\&.
.RE
.PP
\-v, \-\-verbose
.RS 4
Increase the level of detail in the output\&. May be specified multiple times to further increase verbosity\&.
.RE
.sp
These options can also be set as machine\-wide defaults in nvme\-cli\&.conf(5)\&. A command\-line flag always overrides the file\&.
.SH "EXAMPLES"
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Has the program interpret the returned buffer and display the known fields in a human readable format:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme id nvm\-ns /dev/nvme0n1
.fi
.if n \{\
.RE
.\}
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
If using the character device or overriding namespace id:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme id nvm\-ns /dev/nvme0 \-n 1
# nvme id nvm\-ns /dev/nvme0n1 \-n 1
# nvme id nvm\-ns /dev/nvme0 \-\-namespace\-id=1
.fi
.if n \{\
.RE
.\}
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Have the program return the raw structure in binary:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme id nvm\-ns /dev/nvme0n1 \-o binary > id_ns\&.raw
# nvme id nvm\-ns /dev/nvme0n1 \-\-output\-format=binary > id_ns\&.raw
.fi
.if n \{\
.RE
.\}
.sp
It is probably a bad idea to not redirect stdout when using this mode\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Alternatively you may want to send the data to another program that can parse the raw buffer\&.
.sp
.if n \{\
.RS 4
.\}
.nf
NVME
.fi
.if n \{\
.RE
.\}
.RE
.sp
Part of the nvme\-user suite