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, 10
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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, 10
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- Suppose the head of a moving-head disk with 200 tracks numbered 0 to 199 is currently servinga request at track 100 .The queue of outstanding requests in FIFO order is: 23, 89, 132, 42 and 187.What is the total number of head movements (in cylinders) for the following disk-schedulingalgorithms?Different algorithms are used for scheduling the disk head so that seek time may be reduced. Calculate total number of heads movement for the following algorithms for the given numbers of disk cylinders Look Scan C-Scan Current Head Position: 71 Queue: 82, 153, 14, 149, 6, 189, 62, 99, 121 Direction = From current block towards right sideDifferent algorithms are used for scheduling the disk head so that seek time may be reduced. Calculate a total number of heads movement for the following algorithms for the given numbers of disk cylinders. Shortest Seek Time First (SSTF) b) Circular Look (C-Look) Head Start: 71 Queue: 82 , 153 , 14 , 149 , 6 , 189 , 62 , 99 , 121
- A disk has a capacity of two tera-byte size. Say the file system uses a multi-level inode structure for locating the data blocks of afile.The inode stores pointers to data blocks, including a single indirect block, a double indirect block, and several direct blocks in the 64 B of available space.Now, it is given that the disk has a block size of 512 B. The maximum file size that can be stored in such a file system in MB (round off upto 2 decimal places).Consider the following disk request sequence for a disk with 100 tracks 54, 25, 76, 85, 10, 50, 77, 43, 61, 21. Head pointer starting at 30 and moving in left direction. 1) Find the number of head movements in cylinders using C-Scan scheduling. 2) Find the number of head movements in cylinders using C-Look scheduling.Different algorithms are used for scheduling the disk head so that seek time may be reduced. Calculate total number of heads movement for the following algorithms for the given disk queue with requests for I/O to blocks on cylinders in that order. Queue = 98, 183, 37, 122, 14, 124, 65, 67 If the disk head is initially at cylinder 53 and direction is Right. FCFS – First-Come, First-Served - FCFS
- Consider an ordered disk queue with involving requests tracks 97,145,22,14,124,65 and 67. if the read write head is initially at track 53 , what is the total distance that the disk are moves to satisfy all the pending request for C-SCAN?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)In a main memory-disk virtual storage system, the page size is 1KByte and the OPTIMAL algorithm is used for page replacements. A given program has been allocated three page frames in the main memory and it makes the following 16 memory references when it starts executing (the addresses are given in decimal):500, 2000, 2500, 800, 4000, 1000, 5500, 1500, 2800, 400, 5000, 700, 2100, 3500, 900, 2400 Fill in the contents of the three page frames after each memory reference in a table and calculate the hit ratio. Hint: denote by 'a' the page consisting of locations 0 through 1023 in memory. Similarly, b: 1024-2047, c: 2048-3071, d: 3072-4095, e: 4096-5119 and f: 5120-6143. Round to three decimal places.
- . Different algorithms are used for scheduling the disk head so that seek time may be reduced. Calculate total number of heads movement for the following algorithms for the given numbers of disk cylinders. Shortest Seek Time First (SSTF) Circular Look (C-Look) Look Scan C-Scan Current Head Position: 71 Queue: 82, 153, 14, 149, 6, 189, 62, 99, 121 Direction = From current block towards right sideFind out the total Head Movement of the Disk Head for the following request queue: 98, 183, 37, 122, 14, 124, 65, 67 Using the algorithms: a) FCFS b) SSTF c) SCAN d) C-SCAN e) C-LOOK The question did not state any initial head cylinder number.Consider a disk pack with 32 surfaces, 64 tracks and 512 sectors per pack. 256 bytes of data are stored in a bit serial manner in a sector. The number of bits required to specify a particular sector in the disk is.