Suppose that a disk drive has 5,000 cylinders, numbered 0 to 4,999. The drive is currently serving a request at cylinder 2,150, and the previous request was at cylinder 1,805. The queue of pending requests, in FIFO order, is: 2,069 1,212 2,296 2,800 544 1,618 356 1,523
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Suppose that a disk drive has 5,000 cylinders, numbered 0 to 4,999. The drive is currently serving a request at cylinder 2,150, and the previous request was at cylinder 1,805. The queue of pending requests, in FIFO order, is:
2,069
1,212
2,296
2,800
544
1,618
356
1,523
4,965
3681
a. FCFS
b. SSTF
c. SCAN
d. LOOK
e. C-SCAN
f. C-LOOK
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- Suppose that a disk drive has 5,000 cylinders, numbered 0 to 4,999. The drive is currently serving a request at cylinder 2,150, and the previous request was at cylinder 1,805. The queue of pending requests, in FIFO order, is: 2,069, 1,212, 2,296, 2,800, 544, 1,618, 356, 1,523, 4,965, 3681 Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests for each of the following disk- scheduling algorithms? e. C-SCAN f. C-LOOKSuppose that a disk drive has 6,000 cylinders, numbered 0 to 5999. The drive is currently serving a request at cylinder 3797, and the previous request was at cylinder 1375. The queue of pending requests, in FIFO order, is: 1589, 5474, 2104, 1350, 4336, 3678, 1697, 1780, 3794, 3982, 2508 Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests for each of the following disk-scheduling algorithms? Show the calculation result Show the sequence of the position of the head and calculation steps 1. SSTF 2. SCANSuppose that a disk drive has 5,000 cylinders, numbered 0 to 4,999. The drive is currently serving a request at cylinder 2,150, and the previous request was at cylinder 1,805. The queue of pending requests, in FIFO order, is: 2,069 1,212 2,296 2,800 544 1,618 356 1,523 4,956 3,681 Calculate the total seek time for each of the schedules TOTAL DISTANCE TOTAL SEEK TIME FCFS SSTF SCAN LOOK C-SCAN C-LOOK
- Suppose a disk has N cylinders, numbered from 0 to P. At some time, the disk arm is at cylinder X, and there is a queue of disk access requests for cylinders R1, R2, R3, R4. Explain which Disk scheduling algorithm should be the best to be used between the following a) FIFO b) CSCAN c) SSTF d) FSCAN e) CLOOK N: B • • Choose any acceptable numeric numbers for N, P, X, R1, R2, R3 and R4 • • Plagiarism Will be penalized heavilySuppose that a disk drive has 40 cylinders, numbered 0 to 40. The drive is currently serving a requestat cylinder 20 (the previous request served was at cylinder 19) when the last of these requests is madewith none of these requests yet served. The queue of pending requests, in FIFO order, is 5, 25, 18, 3,39, 8, and 35. A seek takes 5ms per cylinder movement. Starting from the current head position, whatis the total distance (in cylinders) that the disk arm moves to satisfy all the pending request and alsocalculate the total seek time needed to serve these requests, for each of the following disk-schedulingalgorithms? Explain with the help of a diagram in each case. a. FCFSb. SSTFc. SCANd. LOOKConsider a disk queue with requests for I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10. The C-LOOK scheduling algorithm is used. The head is initially at cylinder number 63, moving towards larger cylinder numbers on its servicing pass. The cylinders are numbered from 0 to 199. The total head movement (in number of cylinders) incurred while servicing these requests is
- Suppose the head of a moving head disk with 200 tracks numbered 0-199 is currently servinga request at track 143. It has just finished a request at track 125. If the queue of requests iskept in the FIFO order,86,147,85,177,94,150,102,175,130What is the total head movement to satisfy these requests for the following disk schedulingalgorithms? First Come First Served Shortest Seek Time First SCANb) Consider a disk queue with requests for I/O to blocks on cylinders 108, 193, 51, 132, 24, 134, 75, 77. The head is initially at cylinder number 63. The cylinders are numbered from 0 to 199. Find out the total head movements using the following algorithms a) First Come-First Serve (FCFS) b) Shortest Seek Time First (SSTF) c) Elevator (SCAN) d) Circular LOOK (C-LOOK)b) Consider a disk queue with requests for I/O to blocks on cylinders 108, 193, 51, 132, 24, 134, 75, 77. The head is initially at cylinder number 63. The cylinders are numbered from 0 to 199. Find out the total head movements using the following algorithmsa) First Come-First Serve (FCFS)b) Shortest Seek Time First (SSTF)c) Elevator (SCAN)d) Circular LOOK (C-LOOK)Suppose that a disk drive has 5,000 cylinders, numbered 0 to 4999. The drive is currently serving a request at cylinder 133, and the previous request was at cylinder 115. The queue of pending requests, in FIFO order, is:76,1460, 903, 1764, 938, 1499, 1012,1740,120. Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests for each of the following disk-scheduling algorithms? (a) FCFS (b).SSTF (c) SCAN (d) LOOK (e) C-SCAN (f) C-LOOK
- Consider a disk queue with requests for I/O to blocks on cylinders.98 183 37 122 14 124 65 67. "Considering SSTF (shortest seek time first) scheduling", the total number of head movements is, if the disk head is initially at 53 is?Suppose file1.txt and file2.txt are both text files in a UNIX file system where each i-node has 8 direct block addresses followed by an indirect block. Suppose file1.txt has 5 blocks of data whereas file2.txt has 11 blocks of data. What are the similarities between their i-nodes? What is the main dissimilarity between their i-nodes? Suppose a file named file1.txt stores five blocks of data, in blocks 2, 3, 5, 7, and 11 in a FAT-32 file system. (a) What does the directory entry for this file look like?(b) What do the FAT entries for this file look like?1. In a certain device, the disk rotates at 5000rpm. a) how long does one revolution take? b) what is the average rotational delay of this disk drive 2. Consider a disk dirve with 1000 tracks, numbered 0 to 999. The request queue has the following composition: 300 740 150 940 200 850 145 555 775 695. The current position is 197 and the previous request was served at 100. For each of the following disk scheduling algorithsm, compute the total distance (in tracks) that the disk arm would move. Include the calculation steps in your answers. 2.1 First - In-First-Out (FIFO) 2.2 Shortest - Service-Time - First (SSTF) 2.3 SCAN (no LOOK variation) 2.4 C-SCAN (No C-LOOK variation)
