Storage Networking Fundamentals: An Introduction to Storage Devices, Subsystems, Applications, Management, and File Systems (Vol 1)

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

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