Consider a disk that is scheduled using the Elevator policy. That is, the disk head scans from the first cylinder to the last and back repeatedly, processing I/O requests along the way. However, the scan direction changes whenever there are no I/O requests in the disk queue in the direction of the scan, but there are I/O requests in the disk queue in the opposite direction. Let the disk have an average rotational latency of 0.5 time units and transfer time of 0.1 time units per sector. The seek time for processing a request is 0, if the request is in the same cylinder that the disk head is currently in. Otherwise, let the seek time be 1+(k-1)*0.1 time units, where k is the number of cylinders travelled.
Let the following table represent a stream of I/O requests for the disk:
Request Arrival Time Cylinder Number of Sectors
R1 t 36 2
R2 t+4 15 5
R3 t+5 25 2
R4 t+6 4 1
R5 t+9 98 5
R6 t+12 36 2
R7 t+15 27 1
R8 t+16 57 5
Assume that the disk head is at cylinder 20 at time t, and no other requests enter the disk queue until all of the above requests are processed. Determine the schedule of processing for the above stream of requests.
Based on the processing schedule, compute the wait times and turnaround times for the various requests. Note that the wait time for a request is the difference between the time at which the disk starts processing the request and the time at which the request arrives; the turnaround time is the difference between the time at which the request processing is completed and the arrival time of the request.
Identify the true statement among the following, with respect to the wait and turnaround times of the various requests.
A. R7 has the largest turnaround time.
B. R3 has the largest wait time.
C. R3 has the largest turnaround time.
D. R5 has the largest turnaround time.

Answercloud computing;

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Answerdata link;

The main part about version control is that you have a repository, which hosts files. any changes done to those files are recorded and, as such, can be reverted back. it is kind of like google drive/google docs (except not as "real-time autosave"). usually these files involve code. version control can usually record changes to files and the lines of code themselves.version control is used by developers, mainly with coding. this may include websites, software, video games, etc. it is very useful in terms of practicality and collaboration.  reverting back a previous version of a file is very useful in the coding/programming world. suppose a programmer adds in something new to a file, a code snippet or two. then he changes his mind because he does not like the feature he coded in (it does not work, inefficient, with version control, he can easily revert back the changes he made.  version control also makes it easier to collaborate. oftentimes, you can use an online, remote  repository such as github or bitbucket. a team of people  can each  connect their computers  to this repository and be synchronised with the source code.recording your changes is also for teamwork  as it tells you who did what. changes can be monitored as well.  online repositories (like  github) may also contain  features to talk about issues with the code, and you can  reference them in the changes.version control also allows you to have different versions of the same thing. there are open source projects where anyone able can contribute to the project; such collaborators are able to create a new version (a new "branch") from the master branch. in this new branch derived from the main master branch, one adds their code and such.  in time, the original developer will look at this branch; they can add all or some of those changes to the main branch if they approve.