Host multi-pathing describes a ____________ solution that has at least two distinct ______________ paths to a
LUN.
A.
Token ring, physical
B.
FC SAN, virtual
C.
FC or IP SAN, virtual
D.
FC or IP SAN, Physical
Explanation:
http://en.wikipedia.org/wiki/Multipath_I/O
Fiber Channel (FC), FCoE and iSCSI encapsulate SCSI-3. FCoE and iSCSI further encapsulate the transport
within IP; hence the term IP SAN.
In computer storage, multipath I/O is a fault-tolerance and performance enhancement technique whereby there
is more than one physical path between the CPU in a computer system and its mass storage devices through
the buses, controllers, switches, and bridge devices connecting them.
A simple example would be a SCSI disk connected to two SCSI controllers on the same computer or a disk
connected to two Fibre Channel ports. Should one controller, port or switch fail, the operating system can route
I/O through the remaining controller transparently to the application, with no changes visible to the applications,
other than perhaps incremental latency.