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#DELL NVME CONTROLLER DRIVER DRIVER#
#DELL NVME CONTROLLER DRIVER PLUS#

By default, NVMe/TCP uses port 8009 for discovery controllers and port 4420 for I/O controllers. Source IP address, source TCP port, destination IP address, and the destination TCP port define the TCP connections. Before data can be transmitted between a host and storage subsystem over a TCP fabric, a TCP connection must be made.

Step 1: Fabric Connection -TCP is a connection-orientated transport.

NVMe/TCP uses a three-step connection process to establish communications between a host and a subsystem controller, as shown in the following figure: Ready to Transfer -A PDU sent from a controller to a host to indicate that it is ready to accept data Host to Controller Data -A PDU sent from a host to a controller to transfer data to the controllerĬontroller to Host Data : A PDU sent from a controller to a host to transfer data to the host Response Capsule -A PDU sent from a controller to a host to transfer an NVMe over fabrics response capsule Host to Controller Terminate Connection Request -A PDU sent from a host to a controller in response to a fatal transport errorĬontroller to Host Terminate Connection Request -A PDU sent from a controller to a host in response to a fatal transport errorĬommand Capsule -A PDU sent from a host to a controller to transfer an NVMe over fabrics command capsule Initialize Connection Response -A PDU sent from a controller to a host to accept a connection request and communicate NVMe/TCP connection parameters Initialize Connection Request -A PDU sent from a host to a controller to communicate NVMe/TCP connection parameters and establish an NVMe/TCP connection The following table shows the NVMe/TCP capsule sizes as defined by the NVMe/TCP Transport Specification: The NVMe base specification outlines default message-based capsule sizes but the transporting fabric specification determines the exact capsule sizes.

#DELL NVME CONTROLLER DRIVER PLUS#

Command capsules contain submission queue entries (SQEs) plus optional data while response capsules contain completion queue entries (CQEs). A capsule is an NVMe unit of information exchange that can be either a command capsule or a response capsule.

#DELL NVME CONTROLLER DRIVER DRIVER#

In message-based fabrics, NVMe commands are placed into capsules (that are encapsulated by host driver software). These commands are placed into a NVMe protocol “command set.” The following table shows the commands for the different command sets as defined by the NVMe Base Standard: A single user command or an application I/O can trigger multiple NVMe commands. In NVMe, all application I/O- or user-issued commands are converted to specific NVMe commands (fabric, admin, I/O). TCP defines how applications can create channels of communication across a network. TCP/IP specifies how data can be exchanged over networks. Transmission Control Protocol/Internet Protocol (TCP/IP) is a suite of communication protocols used to interconnect devices on communication networks. VLANĪ Virtual Local Area Network (VLAN) is any broadcast domain that is partitioned and isolated in a computer network at the datalink layer (Layer 2). Ethernet is commonly used in local area networks (LAN) and wide area networks (WAN). EthernetĮthernet is a family of computer networking technologies operating at the OSI physical layer (Layer 1) also providing services to the OSI datalink layer (Layer 2). The Open Systems Interconnection (OSI) Model is a seven-layer conceptual model that characterizes and standardizes the communication functions of a telecommunication or computer network system without regard to its underlying internal structure and technology. The following section describes the NVMe/TCP components and how they work together to transfer data between a host and a subsystem.