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OPERATING SYSTEMConsider 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?20247mOperating SystemSuppose that a disk drive has 5000 cylinders, numbered 0 to 4999. The drive is currently serving a request at cylinder 2150, and the previous request was at cylinder 1805. The queue of pending requests, in FIFO order, is: 2069; 1212; 2296; 2800; 544; 1618; 356; 1523; 4965; 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 FCFS, SCAN and C-SCAN disk-scheduling algorithms? Draw the head movement diagram also.20239mOperating SystemSuppose that a disk drive has 5000 cylinders, numbered 0 to 4999. The drive is currently serving a request at cylinder 143, and the previous request was at cylinder 125. The queue of pending request, in FIFO order is: 86, 1470, 913, 1774, 948, 1509, 1022, 1750, 130 Starting from the current head position, applying Shortest-seek-time-first (SSTF) algorithm find what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests.20257mOperating SystemSuppose that a disk drive has 5000 cylinders, numbered 0 to 4999. The drive is currently serving a request at cylinder 143, and the previous request was at cylinder 125. The queue of pending request, in FIFO order, is: 86, 1470, 913, 1774, 948, 1509, 1022, 1750, 130 Starting from the current head position, applying Shortest-seek-time-first algorithm find what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests.20247m
PreviousThe address loaded into the memory address register of the memory is referred to as (i) Physical address (ii) IP address (iii) Port address (iv) Logical addressNextThe Trap mode bit changes from 0 to 1 when mode switches to ______ mode. (i) Kernel, User (ii) User, User (iii) Kernel, Kernel (iv) User, Kernel