To be able to make some predictions of disk performance, it is useful to have a modelof storage allocation. Suppose that the disk is viewed as a linear address space ofN» 1 sectors, consisting of a run of data blocks, then a hole, then another run of datablocks, and so on. If empirical measurements show that the probability distributionsfor data and hole lengths are the same, with the chance of either being i sectors as 2-¹,what is the expected number of holes on the disk?

The expected number of holes on the disk is N/4. Explanation: The response given is appropriate.…

s, consisting of a run of data blocks, then a hole, then anothe so on. If empirical measurements show that the probability hole lengths are the same, with the chance of either being i s xpected number of holes on the disk?

s, consisting of a run of data blocks, then a hole, then anothe so on. If empirical measurements show that the probability hole lengths are the same, with the chance of either being i s xpected number of holes on the disk?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

To be able to make some predictions of disk performance, it is useful to have a model
of storage allocation. Suppose that the disk is viewed as a linear address space of
N» 1 sectors, consisting of a run of data blocks, then a hole, then another run of data
blocks, and so on. If empirical measurements show that the probability distributions
for data and hole lengths are the same, with the chance of either being i sectors as 2-¹,
what is the expected number of holes on the disk?

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