I/O Devices and I/O Techniques
Categorize I/O devices and compare programmed I/O, interrupt-driven I/O, and DMA approach.
I/O and File Management
Study I/O handling, DMA, disk scheduling, RAID, and file-system internals.
Learning objectives
- - Differentiate programmed, interrupt, and DMA I/O
- - Apply disk scheduling algorithms
- - Explain RAID levels and disk cache
- - Understand file and directory structures
Topics in this chapter
20 min
DMA and Buffering
Study DMA transfer sequence and buffering types used to bridge producer-consumer speed mismatch.
Disk Arm Scheduling Algorithms
Solve FCFS, SSTF, SCAN, C-SCAN, LOOK, and C-LOOK head movement problems.
RAID and Disk Cache
Understand RAID goals, level trade-offs, and cache-based disk performance improvements.
File Management and File-System Structures
Cover file attributes, file operations, directory models, allocation methods, and free-space tracking.
Question bank for this chapter
Summer 2023Q5(A)
Explain different types of operations performed on the file.
Summer 2023Q5(B)
Discuss DMA.
Summer 2023Q5(B) OR
Discuss RAID.
Summer 2023Q5(C)
For requests 1,36,16,34,9,12 and current head 11 on 51-cylinder disk, calculate total movement for FCFS and SSTF.
Summer 2023Q5(C) OR
For requests 1,36,16,34,9,12 and current head 11 on 51-cylinder disk, calculate total movement for LOOK and SCAN.
Winter 2023Q5(A)
Explain different file operations.
Winter 2023Q5(B)
Write short note on Direct Memory Access.
Winter 2023Q5(B) OR
Explain different types of files.
Winter 2023Q5(C)
For requests 1,36,16,34,9,12 and current head 11 on 51-cylinder disk, find total movement using C-LOOK.
Winter 2023Q5(C) OR
For requests 1,36,16,34,9,12 and current head 11 on 51-cylinder disk, find total movement using C-SCAN.
Summer 2024Q5(A)
Define RAID. Explain RAID0, RAID1 and RAID2.
Summer 2024Q5(B)
Explain different file operations.