3.1. Overview

Assuming SM servers with multiple disk drives, the data blocks are assigned to the disks in order to distribute the load of a display evenly across the disks. Thus, data placement can affect the continuous display and performance of SM servers in conjunction of the scheduling techniques. There are two well-known approaches to assign blocks of an object across multiple disk drives: constrained and unconstrained. A typical example of constrained data placement is round-robin [12], [67], [70]. As suggested by its name, this technique assigns the blocks of an object to the disks in a round-robin manner, starting with an arbitrarily chosen disk. Assuming d disks in the system, if the first block of an object X is assigned to disk d

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