Review Questions Chapter 3
1. What is a virtual tape system and what is it used for?
Virtual tape: a storage device for less frequently needed data so that it appears to be stored entirely on tape cartridges, although some parts of it might actually be located on faster hard disks. Virtual tap can be used with a sophisticated storage-management system that moves data to slower but less costly forms of storage media as people use the data less often.
2. How does the role of primary storage differ from secondary storage?
- Primary storage: the part of the computer that holds program instructions and data.
- Secondary storage: devices that store large amounts of data, instructions, and ...view middle of the document...
This might mitigate the distribution problems associated with hydrogen vehicles, however the major market players discarded the approach of on-board reforming as impractical. (At high temperatures see above).
* Yes, they also have disadvantages:
+ The reformer–fuel-cell system is still being researched but in the near term, systems would continue to run on existing fuels, such as natural gas or gasoline or diesel. However, there is an active debate about whether using these fuels to make hydrogen is beneficial while global warming is an issue. Fossil fuel reforming does not eliminate carbon dioxide release into the atmosphere but reduces the carbon dioxide emissions as compared to the burning of conventional fuels due to increased efficiency. However, by turning the release of carbon dioxide into a point source rather than distributed release, carbon capture and storage becomes a possibility, which would prevent the carbon dioxide's release to the atmosphere, while adding to the cost of the process.
6. What is the difference between a CPU chip and a GPU chip?
* CPU: The part of the computer that consists of three associated elements: the arithmetic/logic unit, the control unit, and the register areas.
* GPU: a specialized circuit that is very efficient at manipulating computer graphics and is much faster than the typical CPU chip at performing floating point operations and executing algorithms for which processing of large blocks of data is done in parallel.
7. What is RAID storage technology?
RAID storage technology: a method of storing data that generates extra bits of data from existing data, allowing the system to create a “reconstruction map” so that if a hard drive fails, the system can rebuild lost data.
8. Outline and briefly explain the two‐phase process for executing machine‐level
The two-phase processes for executing machine-level instructions are nanoseconds and picoseconds.
9. What is a massively parallel processing computer system? How is grid computing
different from such a system? How is it similar?
* Massively parallel processing:
* Links hundreds or thousands of processors to operate at the same time.
* Grid computing:
* Use of a collection of computers to work in a coordinated manner to solve a common problem.
10. Identify the three components of the CPU and explain the role of each.
* Arithmetic/logic unit (ALU):
* Performs mathematical calculations and makes logical comparisons.
* Control unit :
* Sequentially accesses program instructions, decodes them, and coordinates the flow of data in and out of the ALU, registers, primary storage, and even
secondary storage and various output
* High-speed storage areas.
* Used to temporarily hold small units of program instructions and data.
11. Distinguish between a netbook computer and a laptop computer. Distinguish