'\" t
.\"     Title: nvme-ns-descs
.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 04/15/2023
.\"    Manual: NVMe Manual
.\"    Source: NVMe
.\"  Language: English
.\"
.TH "NVME\-NS\-DESCS" "1" "04/15/2023" "NVMe" "NVMe Manual"
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.SH "NAME"
nvme-ns-descs \- Send NVMe Identify for a list of Namespace Identification Descriptor structure, return result and structure
.SH "SYNOPSIS"
.sp
.nf
\fInvme ns\-descs\fR <device> [\-\-namespace\-id=<nsid> | \-n <nsid>]
                        [\-\-raw\-binary | \-b]
                        [\-\-output\-format=<fmt> | \-o <fmt>]
.fi
.SH "DESCRIPTION"
.sp
For the NVMe device given, sends an identify for a list of namespace identification descriptor structures command and provides the result and returned structure\&.
.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)\&. If the character device is given, the \*(Aq\-\-namespace\-id\*(Aq 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\&.
.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 <nsid>, \-\-namespace\-id=<nsid>
.RS 4
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\&.
.RE
.PP
\-b, \-\-raw\-binary
.RS 4
Print the raw buffer to stdout\&. Structure is not parsed by program\&.
.RE
.PP
\-o <format>, \-\-output\-format=<format>
.RS 4
Set the reporting format to
\fInormal\fR,
\fIjson\fR, or
\fIbinary\fR\&. Only one output format can be used at a time\&.
.RE
.SH "EXAMPLES"
.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 #2:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme ns\-descs /dev/nvme0 \-n 1
# nvme ns\-descs /dev/nvme0n1 \-n 2
# nvme ns\-descs /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 ns\-descs /dev/nvme0n1 \-\-raw\-binary > ns_descs\&.raw
# nvme ns\-descs /dev/nvme0n1 \-b > ns_descs\&.raw
.fi
.if n \{\
.RE
.\}
.sp
It is probably a bad idea to not redirect stdout when using this mode\&.
.RE
.SH "NVME"
.sp
Part of the nvme\-user suite