'\" t
.\"     Title: nvme-connect
.\"    Author: [see the "AUTHORS" section]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 11/11/2021
.\"    Manual: NVMe Manual
.\"    Source: NVMe
.\"  Language: English
.\"
.TH "NVME\-CONNECT" "1" "11/11/2021" "NVMe" "NVMe Manual"
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.SH "NAME"
nvme-connect \- Connect to a Fabrics controller\&.
.SH "SYNOPSIS"
.sp
.nf
\fInvme connect\fR
                [\-\-transport=<trtype>     | \-t <trtype>]
                [\-\-nqn=<subnqn>           | \-n <subnqn>]
                [\-\-traddr=<traddr>        | \-a <traddr>]
                [\-\-trsvcid=<trsvcid>      | \-s <trsvcid>]
                [\-\-host\-traddr=<traddr>   | \-w <traddr>]
                [\-\-host\-iface=<iface>     | \-f <iface>]
                [\-\-hostnqn=<hostnqn>      | \-q <hostnqn>]
                [\-\-hostid=<hostid>        | \-I <hostid>]
                [\-\-nr\-io\-queues=<#>       | \-i <#>]
                [\-\-nr\-write\-queues=<#>    | \-W <#>]
                [\-\-nr\-poll\-queues=<#>     | \-P <#>]
                [\-\-queue\-size=<#>         | \-Q <#>]
                [\-\-keep\-alive\-tmo=<#>     | \-k <#>]
                [\-\-reconnect\-delay=<#>    | \-c <#>]
                [\-\-ctrl\-loss\-tmo=<#>      | \-l <#>]
                [\-\-duplicate\-connect      | \-D]
                [\-\-disable\-sqflow         | \-d]
                [\-\-hdr\-digest             | \-g]
                [\-\-data\-digest            | \-G]
                [\-\-output\-format=<fmt>    | \-o <fmt>]
.fi
.SH "DESCRIPTION"
.sp
Create a transport connection to a remote system (specified by \-\-traddr and \-\-trsvcid) and create a NVMe over Fabrics controller for the NVMe subsystem specified by the \-\-nqn option\&.
.SH "OPTIONS"
.PP
\-t <trtype>, \-\-transport=<trtype>
.RS 4
This field specifies the network fabric being used for a NVMe\-over\-Fabrics network\&. Current string values include:
.TS
allbox tab(:);
lt lt
lt lt
lt lt
lt lt
lt lt.
T{
Value
T}:T{
Definition
T}
T{
rdma
T}:T{
The network fabric is an rdma network (RoCE, iWARP, Infiniband, basic rdma, etc)
T}
T{
fc
T}:T{
\fBWIP\fR
The network fabric is a Fibre Channel network\&.
T}
T{
tcp
T}:T{
The network fabric is a TCP/IP network\&.
T}
T{
loop
T}:T{
Connect to a NVMe over Fabrics target on the local host
T}
.TE
.sp 1
.RE
.PP
\-n <subnqn>, \-\-nqn <subnqn>
.RS 4
This field specifies the name for the NVMe subsystem to connect to\&.
.RE
.PP
\-a <traddr>, \-\-traddr=<traddr>
.RS 4
This field specifies the network address of the Controller\&. For transports using IP addressing (e\&.g\&. rdma) this should be an IP\-based address (ex\&. IPv4)\&.
.RE
.PP
\-s <trsvcid>, \-\-trsvcid=<trsvcid>
.RS 4
This field specifies the transport service id\&. For transports using IP addressing (e\&.g\&. rdma) this field is the port number\&. By default, the IP port number for the RDMA transport is 4420\&.
.RE
.PP
\-w <traddr>, \-\-host\-traddr=<traddr>
.RS 4
This field specifies the network address used on the host to connect to the Controller\&. For TCP, this sets the source address on the socket\&.
.RE
.PP
\-f <iface>, \-\-host\-iface=<iface>
.RS 4
This field specifies the network interface used on the host to connect to the Controller (e\&.g\&. IP eth1, enp2s0, enx78e7d1ea46da)\&. This forces the connection to be made on a specific interface instead of letting the system decide\&.
.RE
.PP
\-q <hostnqn>, \-\-hostnqn=<hostnqn>
.RS 4
Overrides the default Host NQN that identifies the NVMe Host\&. If this option is not specified, the default is read from /etc/nvme/hostnqn first\&. If that does not exist, the autogenerated NQN value from the NVMe Host kernel module is used next\&. The Host NQN uniquely identifies the NVMe Host\&.
.RE
.PP
\-I <hostid>, \-\-hostid=<hostid>
.RS 4
UUID(Universally Unique Identifier) to be discovered which should be formatted\&.
.RE
.PP
\-i <#>, \-\-nr\-io\-queues=<#>
.RS 4
Overrides the default number of I/O queues create by the driver\&.
.RE
.PP
\-W <#>, \-\-nr\-write\-queues=<#>
.RS 4
Adds additional queues that will be used for write I/O\&.
.RE
.PP
\-P <#>, \-\-nr\-poll\-queues=<#>
.RS 4
Adds additional queues that will be used for polling latency sensitive I/O\&.
.RE
.PP
\-Q <#>, \-\-queue\-size=<#>
.RS 4
Overrides the default number of elements in the I/O queues created by the driver\&.
.RE
.PP
\-k <#>, \-\-keep\-alive\-tmo=<#>
.RS 4
Overrides the default keep alive timeout (in seconds)\&.
.RE
.PP
\-c <#>, \-\-reconnect\-delay=<#>
.RS 4
Overrides the default delay (in seconds) before reconnect is attempted after a connect loss\&.
.RE
.PP
\-l <#>, \-\-ctrl\-loss\-tmo=<#>
.RS 4
Overrides the default controller loss timeout period (in seconds)\&.
.RE
.PP
\-D, \-\-duplicate\-connect
.RS 4
Allows duplicated connections between same trnsport host and subsystem port\&.
.RE
.PP
\-d, \-\-disable\-sqflow
.RS 4
Disables SQ flow control to omit head doorbell update for submission queues when sending nvme completions\&.
.RE
.PP
\-g, \-\-hdr\-digest
.RS 4
Generates/verifies header digest (TCP)\&.
.RE
.PP
\-G, \-\-data\-digest
.RS 4
Generates/verifies data digest (TCP)\&.
.RE
.PP
\-o <format>, \-\-output\-format=<format>
.RS 4
Set the reporting format to
\fInormal\fR
or
\fIjson\fR\&. Only one output format can be used at a time\&. When this option is specified, the device associated with the connection will be printed\&. Nothing is printed otherwise\&.
.RE
.SH "EXAMPLES"
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Connect to a subsystem named nqn\&.2014\-08\&.com\&.example:nvme:nvm\-subsystem\-sn\-d78432 on the IP4 address 192\&.168\&.1\&.3\&. Port 4420 is used by default:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme connect \-\-transport=rdma \-\-traddr=192\&.168\&.1\&.3 \e
\-\-nqn=nqn\&.2014\-08\&.com\&.example:nvme:nvm\-subsystem\-sn\-d78432
.fi
.if n \{\
.RE
.\}
.RE
.SH "SEE ALSO"
.sp
nvme\-discover(1) nvme\-connect\-all(1)
.SH "AUTHORS"
.sp
This was co\-written by \m[blue]\fBJay Freyensee\fR\m[]\&\s-2\u[1]\d\s+2 and \m[blue]\fBChristoph Hellwig\fR\m[]\&\s-2\u[2]\d\s+2
.SH "NVME"
.sp
Part of the nvme\-user suite
.SH "NOTES"
.IP " 1." 4
Jay Freyensee
.RS 4
\%mailto:james.p.freyensee@intel.com
.RE
.IP " 2." 4
Christoph Hellwig
.RS 4
\%mailto:hch@lst.de
.RE