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- Disk requests are received by a disk drive for cylinders 13 , 6 , 1 , 29 , 28 , 8 in that order and the head pointer starts at 9 . A seek takes 5 ms per cylinder moved. How much seek time is needed to serve these requests by using the First Come First Served (FCFS) disk scheduling algorithm? a. 315 b. 305 c. 325 d. 320 e. 310c) Suppose a disk has 300 cylinders, numbered from 0 to 299. The drive is currently serving an I/O request at cylinder 111 and the disk head was previously serving a request at cylinder 99, and there is a queue of disk access requests for cylinders as below: 181, 199, 150, 160, 85, 178, 109, 75 Starting from the current head position, calculate the total head movements using the following disk scheduling algorithms.(i) SSTF scheduling (ii) SCAN schedulingSuppose the head of a moving-head disk with 200 tracks numbered 0 to 199 is currently serving a request at track 99 and has just finished a request at track 125. The queue of outstanding requests in FIFO order is: 5, 95, 75, 100,30 and 155. What is the total number of head movements (in cylinders) for the following disk-scheduling algorithms? FCFS Scheduling SCAN Scheduling SSTF Scheduling
- Assume that you have a disk that has 191 tracks (numbered 0- 190) and the header current position is at track 49. A request queue has the following track numbers: 98, 193, 38, 107, 9, 168, 85, 79 Compute the total seek time using FCFS, SSTF, SCAN, CSCAN, LOOK, CLOOK and compare their performance.Find the total head movements for a request queue given below, using FCFS scheduling for a disk of 100 cylinders (0-99). It is assumed that read write head is initially present at cylinder number 50. Request queue for disk cylinders: 75, 25, 30, 68, 40, 89, 10Hi, please solve it correctly ,else i will downvote Consider the following disk request sequence for a disk with 100 tracks. 98, 183, 37, 122, 14, 124, 65, 67 Head pointer starting at 53 (current position of R/W heads) and moving in right direction. Find the number of head movements in cylinders using FCFS scheduling. Subject code - rcs509
- A file system with 300 GByte disk uses a file descriptor with 8 direct block addresses, I indirect block address and 1 doubly indirect block address. The size of each disk block is 128 Bytes and the size of each disk block address is 8 Bytes. The maximum possible file size in this file system will be ?Suppose the head of a moving-head disk with 200 tracks numbered 0 to 199 is currently serving a request at track 99 and has just finished a request at track 125. The queue of outstanding requests in FIFO order is: 5, 95, 75, 100,30 and 155. What is the total number of head movements (in cylinders) for the following disk-scheduling algorithms? a.FCFS Scheduling b.SCAN Scheduling c.SSTF SchedulingOn a 16 GB hard disk drive (HDD), each cluster consists of 32 sectors and each sector has a fixed size of 512 bytes. A text file with a size of 150,000 bytes is to be stored. a. i.What is the size of the slack space, in bytes, once the file has been stored?
- 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 heavilyOn a 16 GB hard disk drive (HDD), each cluster consists of 32 sectors and each sector has a fixed size of 512 bytes. A text file with a size of 150,000 bytes is to be stored. a. i.How many clusters does the text file take up in memory? ii.What is the size of the slack space, in bytes, once the file has been stored?In our discussion of the SSTF disk scheduling algorithm, we stated that the problem of starvation “is at its worst with low disk utilization rates.” Explain why this is so.