Chapter 7

1:	Explain the difference between an interconnect and a SAN.
A1:	Answer: An interconnect is used inside a cabinet to connect devices to controllers, and a SANis used externally, between systems and storage subsystems.
2:	What is the maximum distance of a parallel SCSI LVD bus?
A2:	Answer: 12 meters
3:	What is the highest-priority address on a 16-bit (wide) SCSI bus?
A3:	Answer: ID 7
4:	Why would you use parallel SCSI disks inside a server system connected to a SAN?
A4:	Answer: For boot disks
5:	True or false: Performance with an Ultra ATA/100 disk drive is independent of the type of cable used.
A5:	Answer: False. It requires the 80-pin cable.
6:	Name the two main performance shortcomings of ATA disk drives for storage network applications.
A6:	Answer: No command queuing and no overlapped I/O
7:	Which Fibre Channel topology is used as a device interconnect?
A7:	Answer: Loops
8:	Why isn't Fibre Channel used often for the internal drives inside system cabinets?
A8:	Answer: They don't have off-the-shelf cables and connectors for use in systems.
9:	What is the primary capacity scaling issue with SATA?
A9:	Answer: There is only one drive per SATAconnector.
10:	List the four interconnects from slowest to fastest performance for storage networking applications.
A10:	Answer: ATA, SATA, FC, SCSI