3.5. Online Reconfiguration

In real applications, access frequency varies over time in many reasons. Because the effectiveness of the selective replication is sensitive to the change of access frequency, one may need to periodically reconfigure the number of instances of objects and data placement of them to maximize the system performance. In general, it requires time and extra disk bandwidth to relocate even some parts of huge multimedia objects while servicing user requests. This may result in a significant degradation of the system performance during reconfiguration process. However, while this performance degradation is temporary during reconfiguration, it could be permanent without reconfiguration. Thus, we assume that a system performs ...

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