SCSI-over-Fibre Channel device driver
The SCSI-over-Fibre Channel device driver for Linux® on IBM® Z (zfcp device driver) supports virtual QDIO-based SCSI-over-Fibre Channel adapters (FCP devices) and attached SCSI devices (LUNs).
IBM Z adapter hardware typically provides multiple channels, with one port each. You can configure a channel to use the Fibre Channel Protocol (FCP). This FCP channel is then virtualized into multiple FCP devices. Thus, an FCP device is a virtual QDIO-based SCSI-over-Fibre Channel adapter with a single port.
A single physical port supports multiple FCP devices. Using N_Port ID virtualization (NPIV) you can define virtual ports and establish a one-to-one mapping between your FCP devices and virtual ports.
On Linux, an FCP device is represented by a CCW device that is listed under /sys/bus/ccw/drivers/zfcp. Do not confuse FCP devices with SCSI devices. A SCSI device is identified by a LUN.