nvme-connect(1)
===============

NAME
----
nvme-connect - Connect to a Fabrics controller.

SYNOPSIS
--------
[verse]
'nvme connect'
		[--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>]
		[--config-file=<cfg>      | -J <cfg> ]
		[--dhchap-secret=<secret> | -S <secret>]
		[--dhchap-ctrl-secret=<secret> | -C <secret>]
		[--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]
		[--dump-config            | -O]
		[--output-format=<fmt>    | -o <fmt>]

DESCRIPTION
-----------
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.

OPTIONS
-------
-t <trtype>::
--transport=<trtype>::
	This field specifies the network fabric being used for
	a NVMe-over-Fabrics network.  Current string values include:
+
[]
|=================
|Value|Definition
|rdma|The network fabric is an rdma network (RoCE, iWARP, Infiniband, basic rdma, etc)
|fc  |*WIP* The network fabric is a Fibre Channel network.
|tcp |The network fabric is a TCP/IP network.
|loop|Connect to a NVMe over Fabrics target on the local host
|=================

-n <subnqn>::
--nqn <subnqn>::
	This field specifies the name for the NVMe subsystem to connect to.

-a <traddr>::
--traddr=<traddr>::
	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).

-s <trsvcid>::
--trsvcid=<trsvcid>::
	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.

-w <traddr>::
--host-traddr=<traddr>::
	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.

-f <iface>::
--host-iface=<iface>::
	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.

-q <hostnqn>::
--hostnqn=<hostnqn>::
	Overrides the default Host NQN that identifies the NVMe Host.
	If this option is not specified, the default is read from
	@SYSCONFDIR@/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.

-I <hostid>::
--hostid=<hostid>::
	UUID(Universally Unique Identifier) to be discovered which should be
	formatted.

-J <cfg>::
--config-file=<cfg>::
	Use the specified JSON configuration file instead of the
	default @SYSCONFDIR@/nvme/config.json file or 'none' to not read in
	an existing configuration file. The JSON configuration file
	format is documented in
	https://github.com/linux-nvme/libnvme/doc/config-schema.json

-S <secret>::
--dhchap-secret=<secret>::
	NVMe In-band authentication secret; needs to be in ASCII format as
	specified in NVMe 2.0 section 8.13.5.8 'Secret representation'.
	If this option is not specified, the default is read from
	@SYSCONFDIR@/nvme/hostkey. If that does not exist no in-band authentication
	is attempted.

-C <secret>::
--dhchap-ctrl-secret=<secret>::
	NVMe In-band authentication controller secret for bi-directional
	authentication; needs to be in ASCII format as
	specified in NVMe 2.0 section 8.13.5.8 'Secret representation'.
	If not present bi-directional authentication is not attempted.

-i <#>::
--nr-io-queues=<#>::
	Overrides the default number of I/O queues create by the driver.

-W <#>::
--nr-write-queues=<#>::
	Adds additional queues that will be used for write I/O.

-P <#>::
--nr-poll-queues=<#>::
	Adds additional queues that will be used for polling latency sensitive I/O.

-Q <#>::
--queue-size=<#>::
	Overrides the default number of elements in the I/O queues created
	by the driver.

-k <#>::
--keep-alive-tmo=<#>::
	Overrides the default keep alive timeout (in seconds).

-c <#>::
--reconnect-delay=<#>::
	Overrides the default delay (in seconds) before reconnect is attempted
	after a connect loss.

-l <#>::
--ctrl-loss-tmo=<#>::
	Overrides the default controller loss timeout period (in seconds).

-D::
--duplicate-connect::
	Allows duplicated connections between same transport host and subsystem
	port.

-d::
--disable-sqflow::
	Disables SQ flow control to omit head doorbell update for submission
	queues when sending nvme completions.

-g::
--hdr-digest::
	Generates/verifies header digest (TCP).

-G::
--data-digest::
	Generates/verifies data digest (TCP).

-O::
--dump-config::
	Print out resulting JSON configuration file to stdout.

-o <format>::
--output-format=<format>::
	Set the reporting format to 'normal' or 'json'. 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.

EXAMPLES
--------
* 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:
+
------------
# nvme connect --transport=rdma --traddr=192.168.1.3 \
--nqn=nqn.2014-08.com.example:nvme:nvm-subsystem-sn-d78432
------------

SEE ALSO
--------
nvme-discover(1)
nvme-connect-all(1)


AUTHORS
-------
This was co-written by mailto:james.p.freyensee@intel.com[Jay Freyensee]
and mailto:hch@lst.de[Christoph Hellwig]

NVME
----
Part of the nvme-user suite
