18 Questions
What is the purpose of providing device-independent block size in software?
To allow treating several sectors as a single logical block
Which role does a device driver typically perform?
Manage power and logging of the device
What is a key responsibility of an interrupt handler?
Choose which user process to run next
Why must device drivers be reentrant?
To handle multiple calls into the driver code simultaneously
How do higher level programs benefit from treating several sectors as a single logical block?
It reduces the need to consider disk layout details
What is the primary function of an interrupt service procedure?
Load new process registers after an interrupt
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
In disk arm scheduling, what is the main advantage of using shortest seek first algorithm?
Minimizes disk head movement
What does stable writes operation ensure in stable storage systems?
Data read always matches the data written
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
Which operation is necessary for crash recovery in stable storage systems?
Stable Writes
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
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.
Which method of I/O access puts the burden of all work on the CPU?
Programmed I/O
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.
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.
What must be saved at a bare minimum when dealing with interrupts?
The execution state of the instruction at the current PC.
Which type of interrupt ensures that all instructions before the PC have fully executed?
Precise interrupts
Learn about disk scheduling algorithms with a focus on shortest seek first, where the direction can only be in one way at a time. Explore different error handling techniques such as replacing bad sectors with spare sectors at the controller level or software level. Understand the concept of stable storage using a pair of identical...
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