Computer System Design Lecture 10

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Presentation transcript:

240-334 Computer System Design Lecture 10 Wannarat Suntiamorntut 240-334 By Wannarat

I/O Systems 240-334 By Wannarat

Outline I/O Performance Measures Types and Characteristics of I/O devices Magnetic Disks DMA, Multimedia, OS Summary 240-334 By Wannarat

I/O System Design Performance Expandability Resilience in the face of failure 240-334 By Wannarat

I/O Device Examples 240-334 By Wannarat

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 240-334 By Wannarat

Magnetic Disk Purpose : - Long term, nonvolatile - Large, inexpensive, slow - Lowest level Two majors types : - Floppy disk - Hard disk 240-334 By Wannarat

Organization of Hard Magnetic Disk Typical numbers (Depend on disk size) 500 - 2,000 tracks per surface 32 to 128 sectors per track 240-334 By Wannarat

Magnetic Disk Characteristic 240-334 By Wannarat

Typical Number of Magnetic Disk 240-334 By Wannarat

Disk I/O Performance 240-334 By Wannarat

Examples 240-334 By Wannarat

Magnetic Disk Example 240-334 By Wannarat

Reliability and Availability 240-334 By Wannarat

Disk Array 240-334 By Wannarat

Optical Compact Disk 240-334 By Wannarat

Give command to I/O Device 240-334 By Wannarat

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 240-334 By Wannarat

Polling Programmed I/O 240-334 By Wannarat

DMA 240-334 By Wannarat

IOP 240-334 By Wannarat

Responsibilities of OS 240-334 By Wannarat

OS Requirements 240-334 By Wannarat

OS & I/O Communication requirement 240-334 By Wannarat

Multimedia Bandwidth Requirement 240-334 By Wannarat

Firewire 240-334 By Wannarat

Firewire Operation 240-334 By Wannarat

Summary 240-334 By Wannarat

Responsibilities of OS 240-334 By Wannarat

Next on Lecture 11 240-334 By Wannarat