TAILIEUCHUNG - Lecture Operating system principles - Chapter 11: I/O Management and disk scheduling

After studying this chapter, you should be able to: Summarize key categories of I/O devices on computers, discuss the organization of the I/O function, explain some of the key issues in the design of OS support for I/O, analyze the performance implications of various I/O buffering alternatives,. | Chapter 11 I/O Management and Disk Scheduling Operating System Design Issues I/O Buffering Disk Scheduling Disk Cache Goal: Generality For simplicity and freedom from error, it’s better to handle all I/O devices in a uniform manner Due to the diversity of device characteristics, it is difficult in practice to achieve true generality Solution: use a hierarchical modular design of I/O functions Hide details of device I/O in lower-level routines User processes and upper levels of OS see devices in terms of general functions, such as read, write, open, close, lock, unlock A Model of I/O Organization Logical I/O: Deals with the device as a logical resource and is not concerned with the details of actually controlling the device Allows user processes to deal with the device in terms of a device identifier and simple commands such as open, close, read, write Device I/O: Converts requested operations into sequence of I/O instructions Uses buffering techniques to improve utilization .

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• Lecture Operating system principles
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