Home » Network Appliance » NS0-155 » Host multi-pathing describes a ____________ solution that has at least two distinct ______________ paths to a LUN.
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
Correct Answer: D
Explanation/Reference:
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.
|
Download Printable PDF. VALID exam to help you PASS.
|
 |
