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 moving function outside of the kernel or even

Question: Moving function outside of the kernel or even layering the kernel may provide some benefits. How does virtualization factor into a layered vs. non-layered design discussion? Provide specfic support for your ans ...

Question what is operating research and its application and

Question: What is operating research and its application and scope of operating research

Unikernelas part of the big picture of kernel design take a

UNIKERNEL As part of the big picture of kernel design, take a look at the attached article. In this course, we have not yet covered some of the OS components that are integral to discussing the benefits and detriments of ...

1 from this book you have learned a little about the

1. From this book, you have learned a little about the different file systems inWindows and Linux. To get a better handle on the differences between them, write a short memo describing three properties of each of these f ...

Programming assignment lab schedulerdispatcheryou are to

Programming Assignment Lab: Scheduler/Dispatcher You are to implement a Scheduler in C, C++ and submit the source code, which we will compile and run. Both are to be delivered to the TA as source code through NYU Classes ...

Linux implementation proposallinx llc has a new research

Linux Implementation Proposal Linx, LLC. has a new research and development group - LSDG. All systems in LSDG will run the Linux operating system and will access resources, as well as share resources, with Linx, LLC.'s M ...

Questionpick an aspect of an historical operating system ie

Question: Pick an aspect of an historical operating system (IE. Multics) and detail how a modern system supports that function. 10 to 20 lines are enough and please provide citations or references.

As the system administrator you are always looking for ways

As the system administrator, you are always looking for ways to improve your network. Although there are many different types of operating systems, there are many versions of the operating systems, as well. After much re ...

Questionin the context of the os design discussions there

Question: In the context of the OS design discussions there is a dependence on the goal of the system and the environment. This is a very important aspect of any systems design. One can argue for or against a function, b ...

Operating systemsprogramming assignment- virtual memory

Operating Systems Programming Assignment- Virtual Memory Manager with Paged Segments In this assignment, you will design a virtual memory manager with paged segments, and then simulate its operation for five different pa ...

  • 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

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen