'\" t
.\"     Title: nvme-list-subsys
.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 10/30/2026
.\"    Manual: NVMe Manual
.\"    Source: NVMe
.\"  Language: English
.\"
.TH "NVME\-LIST\-SUBSYS" "1" "10/30/2026" "NVMe" "NVMe Manual"
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.SH "NAME"
nvme-list-subsys \- List all NVMe subsystems
.SH "SYNOPSIS"
.sp
.nf
\fInvme\fR [<global\-options>] \fIlist\-subsys\fR <device>
.fi
.SH "DESCRIPTION"
.sp
Scan the sysfs tree for NVM Express subsystems and return the controllers for those subsystems as well as some pertinent information about them\&. If a device is given, print out only the values for the controllers and subsystems leading to the device\&.
.SH "OPTIONS"
.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\&. Other versions are rejected\&.
.RE
.PP
\-\-quiet
.RS 4
Suppress informational messages\&. Errors are still reported, and \-\-quiet cancels any \-\-verbose for the library log level\&.
.RE
.PP
\-\-set\-options=<key=value>[,<key=value>\&...]
.RS 4
Set libnvme library options for this invocation\&. Supported keys are
\fIforce\-4k\fR,
\fImi\-probe\-enabled\fR,
\fItest\-base\-dir\fR
and
\fItest\-sysfs\-dir\fR\&.
.RE
.PP
\-\-timeout=<ms>
.RS 4
Set the timeout for the command in milliseconds\&.
\fIinfinite\fR
or
\fI\-1\fR
waits without a time limit (0xffffffff)\&.
.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
.if n \{\
.RS 4
.\}
.nf
\m[blue]\fBroot@host\fR\m[]\&\s-2\u[1]\d\s+2# nvme list\-subsys
nvme\-subsys0 \- NQN=nvmf\-test
\e
 +\- nvme0 rdma traddr=1\&.1\&.1\&.3,trsvcid=4420,host_traddr=1\&.1\&.1\&.1
 +\- nvme1 rdma traddr=1\&.1\&.1\&.3,trsvcid=4420,host_traddr=1\&.1\&.1\&.2
nvme\-subsys1 \- NQN=nvmf\-test2
\e
 +\- nvme2 rdma traddr=1\&.1\&.1\&.3,trsvcid=4420,host_traddr=1\&.1\&.1\&.2
 +\- nvme3 rdma traddr=1\&.1\&.1\&.3,trsvcid=4420,host_traddr=1\&.1\&.1\&.1
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
\m[blue]\fBroot@host\fR\m[]\&\s-2\u[1]\d\s+2# nvme list\-subsys \-o json
{
  "Subsystems" : [
    {
      "Name" : "nvme\-subsys0",
      "NQN" : "nvmf\-test"
    },
    {
      "Paths" : [
        {
          "Name" : "nvme0",
          "Transport" : "rdma",
          "Address" : "traddr=1\&.1\&.1\&.3,trsvcid=4420,host_traddr=1\&.1\&.1\&.1",
          "AddressDetails" : {
            "traddr" : "1\&.1\&.1\&.3",
            "host_traddr" : "1\&.1\&.1\&.1",
            "trsvcid" : "4420"
          }
        },
        {
          "Name" : "nvme1",
          "Transport" : "rdma",
          "Address" : "traddr=1\&.1\&.1\&.3,trsvcid=4420,host_traddr=1\&.1\&.1\&.2",
          "AddressDetails" : {
            "traddr" : "1\&.1\&.1\&.3",
            "host_traddr" : "1\&.1\&.1\&.2",
            "trsvcid" : "4420"
          }
        }
      ]
    },
    {
      "Name" : "nvme\-subsys1",
      "NQN" : "nvmf\-test2"
    },
    {
      "Paths" : [
        {
          "Name" : "nvme2",
          "Transport" : "rdma",
          "Address" : "traddr=1\&.1\&.1\&.3,trsvcid=4420,host_traddr=1\&.1\&.1\&.2",
          "AddressDetails" : {
            "traddr" : "1\&.1\&.1\&.3",
            "host_traddr" : "1\&.1\&.1\&.2",
            "trsvcid" : "4420"
          }
        },
        {
          "Name" : "nvme3",
          "Transport" : "rdma",
          "Address" : "traddr=1\&.1\&.1\&.3,trsvcid=4420,host_traddr=1\&.1\&.1\&.1",
          "AddressDetails" : {
            "traddr" : "1\&.1\&.1\&.3",
            "host_traddr" : "1\&.1\&.1\&.1",
            "trsvcid" : "4420"
          }
        }
      ]
    }
  ]
}
.fi
.if n \{\
.RE
.\}
.SH "NVME"
.sp
Part of the nvme\-user suite
.SH "NOTES"
.IP " 1." 4
root@host
.RS 4
\%mailto:root@host
.RE