Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Operating System Expert

problem 1

Disk requests come in to disk driver for cylinders 10, 22, 20, 2, 40, 6, and 38, in that order. A seek takes 6 mes per cylinder moved. How much seek time is required for

(a) First-come, first served.

(b) Closest cylinder next.

(c) Elevator algorithm (initially moving upward).

In all cases, the arm is initially at cylinder 20.

problem 2

A slight change of the elevator algorithm for scheduling disk requests is to always scan in the similar direction, In what respect is this modified algorithm better than elevator algorithm?

problem 3

A RAID could fail if two or more of its drives crash within the short time interval. Assume that probability of one drive crashing in a given hour is p. What is the probability of a k-drive RAID failing in a given hour?

problem 4

Consider magnetic disk consisting of 16 heads and 400 cylinders. This disk is divided into four 100-cylinder zones with the cylinders in different zones containing 160, 200, 240, and 280 sectors, respectively. Suppose that each sector contains 512 bytes, average seek time between adjacent cylinders is 1 msec, and disk rotates at 7200 RPM. Compute the (a) disk capacity, (b) optimal track skew, and (c) maximum data transfer rate.

problem 5

Some operating systems give a system call rename to give a file a new name. Is there any difference at all between using this call to rename a file and just copying the file to a new file with the new name, followed by deleting the old one?

problem 6

One way to use contiguous allocation of the disk and not suffer from holes is to compact disk every time a file is removed. As all files are contiguous, copying a file needs a seek and rotational delay to read file, followed by transfer at full speed. Writing file back needs the same work. Suppose a seek time of 5 msec, a rotational delay of 4 msec, a transfer rate of 8 MB/sec, and average file size of 8 KB, (a) how long does it take to read a file into main memory then prepare it back to disk at new location? (b) Using these numbers, how long will it take to compact half of a 16-GB disk? (c) Dose compacting the disk ever make any sense?

problem 7

Free disk space could be kept track of using a free list or a bit map. Disk addresses need D bits. For a disk with B blocks, F of which are free, state condition under which free list uses less space than bitmap. For D having value 16 bits, express your answer as a percentage of the disk space that should be free.

problem 8

What will happen if the bitmap or free list containing information about free disk blocks was totally lost due to a crash? Is there any way to recover from this disaster, or is it bye-bye disk? Discuss your answers for a UNIX and the FAT-16 file system separately.

Operating System, Computer Science

  • Category:- Operating System
  • Reference No.:- M91954

Have any Question? 


Related Questions in Operating System

Question 1an important service provided by any system is

Question 1: An important service provided by any system is the ability to run a process on a predetermined schedule without human intervention. The "automation" of tasks can reduce the workload of the system administrato ...

What is the purpose of an embedded operating system and why

What is the purpose of an embedded operating system and why would one be used? Discuss at least two advantages and two vulnerabilities in utilizing an embedded OS. Directions: Your completed assignment should be at least ...

The following machine description will provide the basis

The following machine description will provide the basis for this assignment. You will create a virtual machine/operating system for the machine described below that will accept programs in the target machine language. T ...

Linux implementation proposalphelpstech llc has a new

Linux Implementation Proposal PhelpsTech, LLC. has a new research and development group - Medals. All systems in Medals will run the Linux operating system and will access resources, as well as share resources, with Phel ...

Assignment exploring the machinein this assignment you will

Assignment: Exploring the Machine In this assignment, you will explore a computer (i.e., a Windows PC or a Mac computer). Specifically, you will view the system's general information, create a folder on the desktop of th ...

Goals1 to gain hands-on experience with fork exec and wait

Goals: 1. To gain hands-on experience with fork(), exec(), and wait() system calls. 2. To master the basics of multi-process application development. 3. To appreciate the performance and fault-tolerance bene_ts of multi- ...

Operating system proposalobjectivesyour organization is

Operating System Proposal Objectives Your organization is right now researching the utilization of Linux. Your supervisor has solicited you to look into the possibility from utilizing Linux as a part of both the server a ...

Lab-file processingobjectivesbulladd persistent data

Lab-File Processing OBJECTIVES • Add persistent data storage to your Week 4 Lab using text file input/output. PROBLEM: Stocks4U Portfolio Management System The portfolio management system you developed for Stocks4U needs ...

Firewall linux-a simple firewall is a filter which blocks

Firewall (Linux)- A simple firewall is a filter which blocks the packets based on the pre-defined filter rules. There are two general strategies to set-up a filter. One strategy is restrictive firewall which blocks all p ...

Discussionconduct a system evaluation on your computer

Discussion Conduct a system evaluation on your computer (Windows 8 and 10 are covered) to decide if your current computer meets your needs for now and in the future. (Windows 7, Mac OS) • What is your CPU utilization? • ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate