problem Consider a file currently consisting of 100 blocks. Assume that the file

Question

problem

Consider a file currently consisting of 100 blocks. Assume that the file-control block (and the index block, in the case of indexed allocation) is already in memory. Calculate how many disk I/O operations are required for contiguous, linked, and indexed (single-level) allocation strategies, if, for one block, the following conditions hold. In the contiguous-allocation case, assume that there is no room to grow at the beginning but there is room to grow at the end. Also assume that the block information to be added is stored in memory.

a)The block is added at the beginning

b)The block is added in the middle

c)The block is added at the end

d)The block is removed from the beginning

e)The block is removed from the middle

f)The block is removed from the end

Requirements

Must show your work

Must include your reasoning

Must include your calculation steps

another QA

What about MFT? The answer will be complicated if you try to solve this problem for the MFT algorithm

Either solve the problem or explain why it is complicated

Limit your answer to less than 80 words

One extra credit will be given for this bonus question

Explanation / Answer

Multiprogramming with a Fixed number of Tasks (MFT) was intended to serve as a stop-gap until Multiprogramming with a Variable number of Tasks (MVT), the intended "target" configuration of OS/360.Multiprogramming with a Fixed number of Tasks, an option of the OS/360 and successor operating systems.OS/MFT was the juinior member of the main 'OS' seriesof IBM operating systems, the other being OS/MVT. Smaller 360mainframes used DOS. OS/MFT shared JCL and utilities with OS/MVT but allocated memorydifferently. In OS/MFT, partitions of memory were of a fixed number andsize, specified by the generation and configuration of the operating system.As this class of mainframe had typically less than 512K of main memory,partitions tended to be about 128K. With the advent of Virtual Storage and the System 370's Dynamic Address Translation (DAT), OS/MFT was improved to become OS/VS1, takingaccount of virtual storage in a single partition up to 16MB.

solution :-

Contiguous Linked Indexed A 201 1 1 B 101 52 1 C 1 (or 101ish) 3 1 D 198 1 0 E 98 52 0 F 0 100 0

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