NVMe over Fabrics is an extension of the NVMe specification that permits use of storage devices over a network. It is similar to how iSCSI permits access to storage devices using SCSI commands over a TCP/IP network connection. NVMe over Fabrics supports multiple transports including Fibre Channel, RDMA (both iWarp and ROCE), and TCP/IP.
The author has been working on an implementation of NVMe over Fabrics for FreeBSD. The current work includes a simple userspace host (initiator) using the TCP transport as well as an extension to nvmecontrol(8) to discover remote controllers. At the time of submission the author is implementing a kernel-side host using the TCP transport. By the time of the talk the author expects to have completed the kernel-side host as well as a kernel-side controller (target).
The talk will discuss NVMe over Fabrics in general as well as a description of the implementation for FreeBSD.