Disk Scheduling and RAID Disk scheduling is handled by operating systems for scheduling of input/output request for the disk in order to improve overall system performance. This is necessary because, for over four decades now, the increase in the speed of processor and main memory is incomparable with that of the disk. Apart from speed, disk storage space is another important factor in determining the level of performance of a system. Insufficient disk space can serve a bottleneck for system performance even when other resources are at high speeds. This have given rise to development of arrays of disks that operate independently and in parallel. Question List and briefly define the different levels of schemes through which the OS views a set of physical disk drives as a single logical drive.

Disk Scheduling and RAID Disk scheduling is handled by operating systems for scheduling of input/output request for the disk in order to improve overall system performance. This is necessary because, for over four decades now, the increase in the speed of processor and main memory is incomparable with that of the disk. Apart from speed, disk storage space is another important factor in determining the level of performance of a system. Insufficient disk space can serve a bottleneck for system performance even when other resources are at high speeds. This have given rise to development of arrays of disks that operate independently and in parallel. Question List and briefly define the different levels of schemes through which the OS views a set of physical disk drives as a single logical drive.

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter11: Operating Systems

Section: Chapter Questions

Problem 22VE

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Disk Scheduling and RAID Disk scheduling is handled by operating systems for scheduling of input/output request for the disk in order to improve overall system performance. This is necessary because, for over four decades now,the increase in the speed of processor and main memory is incomparable with that of the disk. Apart from speed, disk storage space is another important factor in determining the level of performance of asystem. Insufficient disk space can serve a bottleneck for system performance even when other resources are at high speeds. This have given rise to development of arrays of disks that operate independently and in parallel. Question Describe the scheduling algorithms that can be used by the operating system to manage disks’ I/O requests. Highlight the advantages and disadvantages.
Memory management is the functionality of an operating system which handles or manages primary memory and moves processes back and forth between main memory and disk during execution. Memory management keeps track of each and every memory location, regardless of either it is allocated to some process or it is free. Given five memory partitions of 110 KB, 450 KB, 100 KB, 250 KB, and 500 KB (in order), how would each of the first-fit, best-fit, and worst-fit algorithms place processes of 212 KB, 417 KB, 112 KB, and 426 KB (in order)?Which algorithm makes the most efficient use of memory? Write a program to compare and justify your answer.
Memory management is the functionality of an operating system which handles or manages primary memory and moves processes back and forth between main memory and disk during execution. Memory management keeps track of each and every memory location, regardless of either it is allocated to some process or it is free.Given five memory partitions of 110 KB, 450 KB, 100 KB, 250 KB, and 500 KB (in order), how would each of the first-fit, best-fit, and worst-fit algorithms place processes of 212 KB, 417 KB, 112 KB, and 426 KB (in order)?Which algorithm makes the most efficient use of memory? Write a program in C language to compare and justify your answer. Noted: Plzz I want this code in C language
Memory management is the functionality of an operating system which handles or manages primary memory and moves processes back and forth between main memory and disk during execution. Memory management keeps track of each and every memory location, regardless of either it is allocated to some process or it is free. Given five memory partitions of 110 KB, 450 KB, 100 KB, 250 KB, and 500 KB (in order), how would each of the first-fit, best-fit, and worst-fit algorithms place processes of 212 KB, 417 KB, 112 KB, and 426 KB (in order)?Which algorithm makes the most efficient use of memory? Write a program to compare and justify your answer. C language.
Why rotational latency is usually not considered in disk scheduling?
Operating System: In order to eliminate the need for contiguous allocation of physical memory, paging is assumed as an efficient memory management technique. But in this technique, the user's view of memory is not the same as the actual physical memory, how this could be achieved and how hardware provides such complicated memory translation?
Explain the concept of memory swapping in virtual memory systems and how it impacts system performance. What strategies can optimize swapping?
The standard approach to memory rpotection on multi-programmed computer systems is that the operating system must rely on hardware-provided features implementes on a portion of cpu design called the MMU(memory management unit) The MMU effectively provides protection for program execution, especially because RAM, differently from CPU cores, does permit more than one process loaded at the same time. Explain how the memory-related protection mechanisms work. Make sure to include: - How processor modes impact MMU configuration; - Physical memory versus logical memory; - How the MMU works, including overall structure and the logic it performs; - The protection goals; what we want to protect and why; - Performance costs related to paging mechanism and how caching memory in the CPU can help; - What happens when illegal access occur.
Explain the concept of memory ballooning in virtualized environments. How does it optimize memory usage?
Computer Science Computer system designers must be alert to rapid changes of computer technology. To see one example of how radically change can affect design, consider the evolution of DRAM memory and magnetic disk technologies since the year 1990. At that time DRAM density had been improving for 10 years at a rate of about 60% per year, giving rise every third year to a new generation of DRAM chips with four times more capacity than before. Magnetic disk data recording density had been improving for 40 years at nearly 30% per year, doubling every three years. By 1990, Moore’s Law enabled introduction of 4 megabit DRAM chips. Assume that cost per megabyte for either type of storage is proportional to density, and that in 1990, DRAM costs 20 times more per megabyte than disk storage. Using the historic density improvement rates described above, create a table showing projected relative cost of each DRAM generation and magnetic disk from 1990 for six generations. What conclusions can…
The memory management unit guarantees that no two processes may utilize the same data at the same time by preventing access to that part of memory. A bottleneck in process-to-process communication seems to originate in the memory management unit.
Explain the concept of memory swapping in virtual memory systems. What strategies can optimize its efficiency?