HDD Scheduling Quiz and Algorithms Flashcards

What is the primary reason why disk scheduling is important for HDDs?

What is the term for the physical movement of the read/write head in HDDs?

What is the benefit of leveraging data locality in disk scheduling?

What is the type of disk scheduling that focuses on optimizing data access for Hard Disk Drives (HDDs)?

What is the primary goal of disk scheduling in operating systems?

What is the benefit of disk scheduling in terms of data access?

What is a primary benefit of NVMe scheduling algorithms?

What is a bottleneck in HDD scheduling?

What enables seamless multitasking on an NVMe drive?

How does NVMe improve multitasking compared to HDD?

What is a limitation of HDD scheduling?

What is NOT a characteristic of NVMe scheduling?

What is the primary goal of HDD scheduling algorithms?

Which algorithm prioritizes requests based on their proximity to the current head position?

What is a significant limitation of the FCFS algorithm in the context of HDDs?

What is the primary difference between SCAN and C-SCAN algorithms?

Why are HDD scheduling algorithms essential for optimizing data access on traditional HDD-based systems?

What is a key difference between HDDs and SSDs that makes HDD scheduling algorithms necessary?

Disk Scheduling

Disk scheduling, also known as I/O (Input/Output) scheduling, is a process managed by the operating system to determine the order of servicing requests to read or write data from storage devices.
It's a technique used to improve data access efficiency, particularly important for HDDs to minimize mechanical head movement, and can also optimize SSD performance.

Importance of Disk Scheduling

Minimizing mechanical head movement in HDDs through scheduling optimizes access speed.
Data locality, where frequently accessed data tends to be physically close on the storage device, reduces overall seek time.

HDD Scheduling

HDD scheduling focuses on optimizing data access for Hard Disk Drives (HDDs).
Prioritization of I/O requests based on importance ensures critical tasks experience minimal delays, even in heavy workloads.

HDD vs NVMe Scheduling

Multitasking on an HDD system can be sluggish due to mechanical head movement, creating bottlenecks.
NVMe scheduling prioritizes I/O requests based on importance, optimizing them for efficient processing, and allows for concurrent data transfers for multiple programs.

Common HDD Scheduling Algorithms

First Come First Served (FCFS): processes requests in the order they arrive, not ideal for HDDs as it doesn't consider data location.
Shortest Seek Time First (SSTF): prioritizes the request closest to the current head position, minimizing seek time, suitable for HDDs with random access patterns.
SCAN/C-SCAN: simulates an elevator servicing requests, moving the head in one direction, servicing requests along the way, and then reversing direction.

Learn about the different HDD scheduling algorithms, including First Come First Served (FCFS), and understand their trade-offs in optimizing data access on traditional HDD-based systems.