1. 240-334 Computer System Design Lecture 10
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2. I/O Systems
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3. Outline I/O Performance Measures
Types and Characteristics of I/O devices
Magnetic Disks
DMA, Multimedia, OS
Summary
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4. I/O System Design Performance Expandability Resilience in the face of
failure
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5. I/O Device Examples
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6. I/O System Performance
Depend on
- CPU
- Memory System (internal, main)
- Interconnection
- I/O controller
- I/O devices
- Speed of I/O Software(OS)
- Software usage for the I/O devices
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7. Magnetic Disk Purpose : - Long term, nonvolatile
- Large, inexpensive, slow
- Lowest level
Two majors types :
- Floppy disk
- Hard disk
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8. Organization of Hard Magnetic Disk
Typical numbers (Depend on disk size)
,000 tracks per surface
32 to 128 sectors per track
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9. Magnetic Disk Characteristic
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10. Typical Number of Magnetic Disk
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11. Disk I/O Performance
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12. Examples
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13. Magnetic Disk Example
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14. Reliability and Availability
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15. Disk Array
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16. Optical Compact Disk
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17. Give command to I/O Device
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18. I/O device notifying the OS
The OS needs to know :
- I/O Device has completed an operation
- I/O Operation has encountered error
accomplished in two different ways
- Polling
- I/O Interrupt
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19. Polling Programmed I/O
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20. DMA
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21. IOP
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22. Responsibilities of OS
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23. OS Requirements
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24. OS & I/O Communication requirement
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25. Multimedia Bandwidth Requirement
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26. Firewire
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27. Firewire Operation
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28. Summary
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29. Responsibilities of OS
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30. Next on Lecture 11
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