Comment 9 for bug 1592990

For the protocol question - it is not FCP encapsulated in FICON - here a bit simplified:
I hope that keeps format :-)

+--------+ +--------------------+
| V7000 | | z/VM |
| | | | +-------+
| | | | | Linux |
| | SCSI | EDEV | ECKD | Guest |
| +-----------+ Emulation +---------+ |
+--------+ FCP | | VRITUAL | |
                     | | +-------+
+--------+ | |
| DS8K | | | +-------+
| | ECKD | | ECKD | Linux |
| +-----------+ +---------+ Guest |
| | FICON | | VIRTUAL | |
| | | | | |
+--------+ +--------------------+ +-------+

FCP and FICON are alternative protocols you can drive via fiber.
ECKD and SCSI are the languages that that a driver can talk to a device (one level above the FCP/FICON thing).

So with EDEVs in z/VM for Ubuntu as a Linux guest it is actually the "same" as if you have a dasd disk on a DS8K.

Although the EDEV one it might have a few special attributes / characteristics.