(a) Discuss, with the help of a diagram, why a hierarchical structure is used for system architecture of I/O devices. (b) Suppose that a disk queue with requests for I/O to blocks on cylinders 60, 156, 32, 183, 124, 42. The SCAN scheduling algorithm is used. The head is initially at cylinder number 100 moving towards smaller cylinder numbers on its servicing pass. The cylinders are numbered from 0 to 199. Finfd the total head movement.

Q: Suppose the head of a moving head disk with 200 tracks numbered 0-199 is currently serving a request…

A: 1. FCFS (First Come First Served)

Q: Consider a disk queue with requests for I/O to blocks on cylinders.98 183 37 122 14 124 65 67.…

A: Solution is in Step 2.

Q: Suppose the head of a moving-head disk with 200 tracks numbered 0 to 199 is currently serving a…

A: The answer given as below:

Q: Given the following track requests in the disk queue, compute for the total head movement (THM) and…

A: a) FCFS is a disk scheduling algorithm in which the cylinders are track in a first in first out or…

Q: Suppose that a disk drive has 200 cylinders num- bered 0 to 199. The drive is currently serving a…

A: The Answer is

Q: Suppose that a disk drive has 40 cylinders, numbered 0 to 40. The drive is currently serving a…

A: Operating systems use a disk scheduling algorithm to schedule I/O requests that arrive at the disk.…

Q: Suppose that a disk drive has 40 cylinders, numbered 0 to 40. The drive is currently serving a…

A: FCFS: Order: (20), 5,25,18 3, 39, 8, 35  Seek: 15+20+7+15+36+3+27=151 cylinders, 755 ms   SSTF…

Q: Suppose the head of a moving-head disk with 200 tracks numbered 0 to 199 is currently serving a…

A: Disk Scheduling Algorithms are used to decrease any request's total seek time and schedule I/O…

Q: Suppose the head of a moving-head disk with 200 tracks numbered 0 to 199 is currently serving a…

A: Given: Assume the head of a moving-head disc contains 200 tracks numbered 0 to 199, and it is now…

Q: The disk has 200 tracks numbered from 0-199. The head pointer is currently positioned at 112 moving…

A: Here in this question we have given some disk request and we have asked to find total head movement…

Q: suppose that a disk drive has 200 tracks, numbered 0 to 199. The drive is currently serving a…

A:

Q: Calculate the number of disk tracks traversed using the FCFS, SSTF, SCAN, and LOOK algorithms for…

A: Performance: The speed of the CPU is a key factor that often decides the performance of the system.…

Q: 5. Suppose that a disk drive has 40 cylinders, numbered 0 to 40. The drive is currently serving a…

A:

Q: Suppose that a disk drive has 200 cylinders, numbered from 0 to 199. The drive is currently serving…

A: Answer: I have given answered in the handwritten format in brief explanation.

Q: Suppose following sequence of disk track requests: 27, 129, 110, 186, 147, 41,10, 64, 120. Assume…

A: The complete answer is given below .

Q: 5) A hard disk (with sectors numbered 0 - 255) currently has its head positioned at sector 73. We…

A: Given that, The number of sectors are 256 from 0 to 255. Initial head position= 73 Queue of disk…

Q: Consider a RAID-5 system. Suppose a SQL query reads and updates just one tuple (and, by design, that…

A: RAID 5 is a redundant array of independent disks configuration that uses disk striping with parity.

Q: c) Suppose a disk has 300 cylinders, numbered from 0 to 299. The drive is currently serving an I/O…

A: (i) SSTF Total head movements- 10+24+10+75+10+18+3+18=168

Q: For a 100-cylinder disk, compute the total number of head movements for the request queue provided…

A: The most straightforward disc scheduling algorithm is FCFS. As the name implies, this method…

Q: For a 100-cylinder disk, compute the total number of head movements for the request queue provided…

A: In FCFS scheduling algorithm, the head moves to the tracks in the same requested order So all the…

Q: For the provided log processing function, which fields in a log entry will be accessed? How many…

A: For the provided log processing function, which fields in a log entry will be accessed? How many…

Q: Calculate the number of disk tracks traversed using the SSTF algorithms for the series of disk track…

A: Given: Calculate the number of disk tracks traversed using the SSTF algorithms for the series of…

Q: Consider a disk queue with requests for I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10.…

A: Here, we have to find the total head movement incurred while servicing the above requests.

Q: Consider a disk queue with requests for I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10.…

A: Introduction:Given, request for I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92 and…

Q: Consider a disk queue with requests for I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10.…

A: The Answer is

Q: Consider a disk queue with requests for I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10.…

A: Given that  blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10. And initial cylinder number is 63.

Q: We are given a list of 64-bit memory address references, given as word addresses. Ox03, Oxb4, Ox2b,…

A: According to the information given:- We have to identify the binary word address on the basic of…

Q: serving a request at track 143, and the 05. Suppose that a disk drive has 5000 tracks The drive is…

A: The Answer is

Q: Explain and contrast among the different schemes for organizing a file system: - contiguous…

A: Explain and contrast among the different schemes for organizing a file system: - contiguous…

Q: Explain and contrast among the different schemes for organizing a file system: - contiguous…

A: Contiguous Allocation: Contiguous memory allocation is a memory allocation method that allocates a…

Q: Suppose following sequence of disk track requests: 27, 129, 110, 186, 147, 41, 10, 64, 120. Assume…

A: The SSTF schedule is : 100,110,120,129,147,186,64,41,27,10 = (110-100) + (120-110) + (129-120) +…

Q: If disk queue with requests for I/O to blocks on cylinders.98, 183, 37, 122, 14, 124, 65, 67. Assume…

A: What is SSTF (Shortest Seek Time First) scheduling: - In SSTF scheduling, the head reader moves…

Q: For a 100-cylinder disk, compute the total number of head movements for the request queue provided…

A: In FCFS, the request which arrives first will we served first.

Q: Suppose a byte-addressable computer using set associative cache has 216 bytes of main memory and a…

A: Answer 1. 16 bits in an address cache contain 2^5 block. but each set must have 2 blocks so we have…

Q: It is given that on a system, on average, an instruction executes in 1 nano second. Suppose that it…

A: Introduction :Given A system , on average, an instruction executes in 1 nano second.page fault…

Q: We are given a list of 64-bit memory address references, given as word addresses. Ox03, Oxb4, Ox2b,…

A:

Q: A processor sends 40 disks I/Os per second, these requests are exponent-distributed, and the average…

A: The Answer is

Q: Consider a 2-way set associative cache with 32-bit address. The block offset takes 5 bits, the index…

A: Eасh  set  соntаins  twо  wаys  оr  degrees  оf  аssосiаtivity.  Eасh  wаy  соnsists  оf  а  dаtа…

Q: Find the total head movements for a request queue given below, using FCFS scheduling for a disk of…

A: The given I/O blocks for FCFS Scheduling 75, 25, 30, 68, 40, 89, 10 where head is initially at…

Q: A computer has 32-bit virtual addresses and the page size is 2^9 KB. Suppose the text, data, and…

A: Here the virtual address size is 32 bits. Page size is 29 Bytes. Two level page table.

Q: Calculate the number of disk tracks traversed using the FCFS algorithms for the series of disk track…

A: Given: Calculate the number of disk tracks traversed using the FCFS algorithms for the series of…

Q: Consider a memory of size 8KB (8192 bytes) that allows dynamic, variable sized partitioning among…

A: ans :: As given in the question, P1 is allocated 500 bytes of memoryBase address BA = 2000Updated…

Q: Suppose a byte-addressable computer using set-associative cache has 216 bytes of main memory and a…

A: Introduction of Cache Mapping and its types: A cache is very high-speed computer memory and it is…

Q: Suppose there are four processes (P1 - P4) with respective arrival times of 0, 10, 30, and 40, and…

A: Required: Suppose there are four processes (P1 - P4) with respective arrival times of 0, 10, 30, and…

Q: For a 100-cylinder disk, compute the total number of head movements for the request queue provided…

A: In FCFS, request which arrives first will be executed first.

Q: (B) Consider the requests from processes in given order 300K, 25K, 125K and 50K. Let there be two…

A: Best Fit: 300K is allocated from a block of size 350K so 50 is left in the block. 25K is allocated…

Q: (A) For each reference, list (i) its tag, index, and offset, (ii) whether it is a hit or a miss, and…

A: For Direct mapping of cache, Line no = block no mod(no of cache lines) Here, offset= 0-4 = 5 bits=32…

Q: Suppose the search field is V = 9 bytes long, the disk block size is B = 512 bytes, a record pointer…

A: Introduction :Given ,69% full B-Tree. Search field V = 9 byte block size = 512 Byte record pointer =…

Q: Problem 1 Consider a direct mapped cache of size 16 KB with block size 256 bytes. The size of main…

A: Step 1  The solution is given in the below step

Q: Consider a demand-paging system with a paging disk that has an average access/transfer time of 50…

A: In any system that uses demand paging, the operating system copies a disk page into physical memory…