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fiber channel controllers or SCSI controllers.
All it is doing is identifying the underlying controller interface/driver.
Fiber channel controllers have a different topology as they allow for multiple connections to the same device - giving rise to multiple device names for the same storage device (hence the wwn names being assigned in /dev/disk/by-id). Fiber channel is a network based connection - thus allowing for two fiber channel controllers to connect to two (or more) fiber channel routers (cross connected) and then cross connect the disk devices. It also permits multiple systems to be added to the network, with both systems having parallel access to the SAME devices.
SCSI controllers rarely do that except when a disk device has multi-port capability, and then that multi-port connection is most often used to attach different systems. I have only seen SCSI as point-to-point connections.
NAS devices can fake things out (like iSCSI), or foe (fiber over ethernet), but it is the ethernet providing the routing in those cases, not SCSI (or fiber).
Last edited by jpollard; 10-27-2016 at 07:14 PM.
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