data flow through san

application (its cache/buffers)
kernel (interface)
file system
file system memory cache
kernel
VM or virtualization agent
abstraction layer storing device driver (storage command interpreter mostly)
low-level device driver (physical connection)
system memory bus
system I/O bus
HBA wiring including any virtualization operators in the path
storage subsystem controller
storage subsystem cache (optional)
storage subsystem internal connectivity
storage replication buffer/latency (sync/async)
device controller
device buffer memory
device media



OSI layers -vs- FC
	7-6
	4 = FC-4 ULP-FCP
	3 = FC-3 services,encryption
	2 = FC-2 framing, flowcontrol
	1 = FC-1 encoding, linkcontrol
	    FC-0 physical