Disk Scheduling Algorithms and Error Handling

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What is the purpose of providing device-independent block size in software?

To ensure each disk has the same sector size

To allow treating several sectors as a single logical block (correct)

To make higher level programs consider disk layout

To streamline driver initialization process

Which role does a device driver typically perform?

Interact directly with the user interface

Manage power and logging of the device (correct)

Implement advanced scheduling algorithms

Handle memory allocation for software requests

What is a key responsibility of an interrupt handler?

Format the disk for new data storage

Allocate memory for new processes

Initialize the device driver

Choose which user process to run next (correct)

Why must device drivers be reentrant?

To handle multiple calls into the driver code simultaneously Signup and view all the answers

How do higher level programs benefit from treating several sectors as a single logical block?

It reduces the need to consider disk layout details Signup and view all the answers

What is the primary function of an interrupt service procedure?

Load new process registers after an interrupt Signup and view all the answers

What is the purpose of using a pair of identical disks in stable storage?

To ensure that both disks write and read the same data Signup and view all the answers

In disk arm scheduling, what is the main advantage of using shortest seek first algorithm?

Minimizes disk head movement Signup and view all the answers

What does stable writes operation ensure in stable storage systems?

Data read always matches the data written Signup and view all the answers

How does the controller handle bad sectors in error handling within stable storage systems?

Maps bad sectors to corresponding good sectors and handles all requests Signup and view all the answers

Which operation is necessary for crash recovery in stable storage systems?

Stable Writes Signup and view all the answers

What is the main difference between One-Shot Mode and Square-Wave Mode in programmable clocks?

One-Shot Mode requires manual restart while Square-Wave Mode does not Signup and view all the answers

What is the main difference between precise interrupts and imprecise interrupts?

Precise interrupts leave the machine in a well-defined state, while imprecise interrupts do not. Signup and view all the answers

Which method of I/O access puts the burden of all work on the CPU?

Programmed I/O Signup and view all the answers

In Interrupt-Driven I/O, what happens when the I/O controller sends an interrupt signal?

CPU context switches to a different process and transfers control back to the I/O dependent-process. Signup and view all the answers

What is one of the issues mentioned when handling character-based I/O with interrupts?

Handling interrupts for every update can result in significant overhead. Signup and view all the answers

What must be saved at a bare minimum when dealing with interrupts?

The execution state of the instruction at the current PC. Signup and view all the answers

Which type of interrupt ensures that all instructions before the PC have fully executed?

Precise interrupts Signup and view all the answers

Disk Scheduling Algorithms and Error Handling

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