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EXAM ON FILE SYSTEMS AND I/O SPRING 2005 CSC 262 OPERATING SYSTEMS NICHOLAS R. HOWE This is a closed book exam. You may use one double-sided 8.5×11 sheet of notes. All answers to this exam should

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How to fill out disk head scheduling

01

To fill out disk head scheduling, follow these points:

02

Determine the scheduling algorithm to use. There are various algorithms like FCFS (First-Come, First-Served), SSTF (Shortest Seek Time First), SCAN, C-SCAN, LOOK, etc.

03

Analyze the disk access pattern to understand the frequency and order of the disk requests.

04

Start by selecting the first request in the queue and position the disk head at that track.

05

Calculate the seek time required to reach the next request from the current head position.

06

Repeat step 4 until all requests in the queue are processed.

07

Keep track of the total seek time required for each request and compute the average seek time.

08

You may also need to consider factors like rotational delay and transfer time depending on the specific scheduling algorithm.

09

Once all requests are processed, the disk head scheduling is filled out.

Who needs disk head scheduling?

01

Disk head scheduling is needed in computer systems that utilize magnetic disks for storage.

02

It is particularly important in systems that have heavy disk access and large amounts of data to be retrieved or stored.

03

Examples of users who need disk head scheduling include database servers, file servers, multimedia applications, and any system that heavily depends on disk I/O operations.

04

Disk head scheduling helps to optimize the order in which disk requests are serviced, reducing disk seek time and improving overall system performance.

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What is disk head scheduling?

Disk head scheduling refers to the method used to decide the order in which disk I/O requests are processed, optimizing the movement of the disk's read/write head to reduce seek time and improve overall system performance.

Who is required to file disk head scheduling?

Entities that utilize disk storage systems and need to manage and optimize disk I/O operations are required to file disk head scheduling.

How to fill out disk head scheduling?

To fill out disk head scheduling, one must provide details of the disk I/O requests including the queue sequence, disk block numbers, and timestamps, along with any relevant identifiers for the processes involved.

What is the purpose of disk head scheduling?

The purpose of disk head scheduling is to increase efficiency in data retrieval during read/write operations, minimizing the time the disk's head spends seeking data and improving overall system throughput.

What information must be reported on disk head scheduling?

The information that must be reported includes request sequence, block numbers, process identifiers, and timestamps for each I/O request.

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