Why is rotational latency not considered in disk scheduling, Operating System

Assignment Help:

Q. Why is rotational latency typically not considered in disk scheduling? How would you alter SSTF, SCAN and C-SCAN to comprise latency optimization?

Answer: Most disks don't export their rotational position information to the host. Even if they did and the time for this information to reach the scheduler would be subject to imprecision and the time consumed by the scheduler is variable therefore the rotational position information would become incorrect. Additional the disk requests are typically given in terms of logical block numbers as well as the mapping between logical blocks and physical locations is very complex.


Related Discussions:- Why is rotational latency not considered in disk scheduling

Producer-consumer, The general idea of a producer-consumer architecture is ...

The general idea of a producer-consumer architecture is related to building a pipeline of threads, similar to the web spider from Project 2. Each step of the processing will now be

Explain how the system can deal with the starvation problem, Q. Can a syste...

Q. Can a system detect that some of its processes are starving? If you answer "yes," explain how it can. If you answer "no," explain how the system can deal with the starvation pro

Determine the task of the pass ii in a two-pass assembler, Determine the ta...

Determine the task of the Pass II In a two-pass assembler Synthesize the target program is the task of the Pass II

Define paging , Paging: Only the needed memory pages are moved to main me...

Paging: Only the needed memory pages are moved to main memory from the swap machine for execution. Process size does not matter. Produce the concept of the virtual memory. It

Business, why some companies do not pay sufficient attention to staff induc...

why some companies do not pay sufficient attention to staff induction

Unix and linux commands, To explore the UNIX file system, use basic UNIX co...

To explore the UNIX file system, use basic UNIX commands and use a text editor. Task:   1.      Logon to Linux. 2.      Create a directory "Unix" under your home d

Explain deadlock, Explain Deadlock Every process in a set of processes ...

Explain Deadlock Every process in a set of processes is waiting for an event which only a process in the set can cause.

Basic synchronization, (Add synchronization to your solutions to HW 3 to el...

(Add synchronization to your solutions to HW 3 to eliminate all of the race conditions.  You should not remove any of the sleep() commands that you used to produce the race conditi

Explain lru page replacement, LRU page replacement In slightest recentl...

LRU page replacement In slightest recently used page replacement algorithm we will replace that page that hasn't been used for the longest period of time. This is similar as an

Define disadvantages of top down parsing of backtracking, Define Disadvanta...

Define Disadvantages of Top Down parsing of Backtracking The disadvantages of top down parsing of backtracking: (i)  Semantic actions cannot be carried out while making a pr

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd