7.4. Conclusion

A growing number of applications store, maintain, and retrieve large volumes of multimedia data, where the data is required to be available online or near-online [162], [163], [77], [108]. Example applications include video-on-demand servers, web-servers, multimedia databases, scientific applications, and e-learning applications. The rapid progress in mass storage technology is enabling designers to implement these large data repositories cost effectively using hierarchical storage structures (HSS), where an HSS consists of a number of fast (expensive) and slow (cheap) storage devices.

In this chapter, we focused on the design of HSS that consists of a three-level hierarchy, with some memory, a number of magnetic disks, and tape ...

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