Chapter 4 Device Management and Disk Scheduling
Chapter 4 Device Management and Disk Scheduling
Content ☆Ⅳ o device overview &lo organization and architecture ☆ 1/0 buffering ☆ Disk scheduling ☆RAID 4 Notes: Difficult to develop a general, consistent solution. just a generally discuss. DEVICE MANAGEMENT
DEVICE MANAGEMENT Content ❖I/O device overview ❖I/O organization and architecture ❖I/O buffering ❖Disk scheduling ❖RAID ❖Notes: Difficult to develop a general, consistent solution. Just a generally discuss
4.1 1/0 Devices(P452) Three categories: Human readable devices s Such as Keyboard, Mouse, Display, Printer and so on machine readable devices Such as Actuator, Controller, sensor, Tape drive, Disk drive and so on Communication devices Such as modem, Network Adapter and so on. DEVICE MANAGEMENT
DEVICE MANAGEMENT 4.1 I/O Devices (P452) Three categories: ❖Human Readable Devices ٭ Such as Keyboard, Mouse, Display, Printer and so on; ❖Machine Readable Devices ٭ Such as Actuator, Controller, Sensor, Tape Drive, Disk Drive and so on; ❖Communication Devices ٭ Such as Modem, Network Adapter and so on
Classify .There are many sorting standard E. g data rates DEVICE MANAGEMENT
DEVICE MANAGEMENT Classify ❖There are many sorting standard. E.g. data rates
Data rates of devices leabit ethernet Graphics display Hard disk Ethernet Optical dIsk Scanner Laser prInter Floppy dIsk Modem Mouse Keyboard 10 103 105 107 Data Rate(bps) Figure ll1 Typical I/O Device Data Rates DEVICE MANAGEMENT
DEVICE MANAGEMENT Data Rates of Devices