Assume the disk contains 100 cylinders (0-99), the head starts at 20, and the queue contain the following request: 90, 2, 4, 16, 12, 25, 74, 6, 91 Calculate the total amount of seek time to service the entire queue using the SCAN algorithm given the read/write head is moving toward track 0
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A: Answer: I have given answered in the handwritten format in brief explanation.
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- Suppose you have a disk that has 400 cylinders numbered 0 to 399. The disk head is currently at cylinder 154 NOTE: the previous serviced request was at 28, that should tell you the direction!) (note: C-SCAN is implemented to service requests in the direction from 0 -> 399) The queue for requests to be serviced looks as follows: 94, 283, 38, 112, 14, 324, 65, 267, Given this information, for the following algorithms:a) SSTFb) C-SCANC) FCFSD) SCANGive the order which the requests in the queue will be processed for each algorithm and calculate the TOTAL distance in cylinders that the read head traveled to satisfy all of the remaining requests.Suppose that a disk drive has 6,000 cylinders, numbered 0 to 5,999. The drive is currently serving a request at cylinder 3,250, and the previous request was at cylinder 4,805. The queue of pending requests, in FIFO order, is:1515, 1212, 1296, 3800, 544, 618, 356, 2523, 5965, 4681Starting from the current head position, what is the total distance (in cylinders) that thedisk arm moves to satisfy all the pending requests for each of the following diskscheduling algorithms?a. FCFSb. SSTFc. SCANd. LOOKSuppose 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; 3,681 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. SCAN c. C-SCAN d. LOOK e. C-LOOK
- Suppose 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 6,000 cylinders, numbered 0 to 5999. The drive is currently serving a request at cylinder 2225, and the previous request was at cylinder 5195 (Hint: this indicates the reading head’s moving direction). The queue of pending requests, in FIFO order, is: 5962,2876,5452,1369,3594,5046,866,3269,409,1744 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 SSTF SCAN LOOK C-SCAN C-LOOKSome applications require two types of accesses to the critical section-read access and write access. For these applications, it is reasonable for multiple read accesses to happen concurrently. However, a write access cannot happen concurrently with either a read access or a write access. Example: For a sequence [R1, R2, W1, R3] of requests, R1 and R2 should be able to access the critical section concurrently while W1 and R3 wait in the queue. Once R1 and R2 leave the critical section, W1 can enter the critical section while R3 waits in the queue. (a) Modify Lamport's algorithm for such applications. (b) Modify Ricart and Agrawala's algorithm for such applications.
- Consider a variant of the RR scheduling algorithm where the entries in the ready queue are pointers to the PCBs. a. What would be the effect of putting two pointers to the same process in the ready queue? b. What would be the major advantages and disadvantages of this scheme? c. How would you modify the basic RR algorithm to achieve the same effect without the duplicate pointers?Suppose that a disk drive has 7,000 cylinders, numbered 0 to 6,999. The drive is currently serving a request at cylinder 1,958, and the previous request was at cylinder 1,807. 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 with First Come First Serverd(FCFS) alogrithim?In asymmetric multiprocessing, the process is taken from the ready queue. Select one: O True O False Drevie IS
- 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-LOOKAn operating system follows a variable memory partitioning model. The system keeps track of empty blocks in a linked list in the order of their address, where each node stores the size of next empty block in the memory. Say that current state of the memory is hold by the linked list shown below, which tells that there are currently four empty blocks in the memory, and the size of first block is 12 byte etc.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? a. FCFS b. SSTF c. SCAN d. LOOK e. C-SCAN f. C-LOOK