2.4. Constrained Data Placement

This study introduces a REgion BasEd bloCk Allocation (REBECA) mechanism that reduces Tw_Seek by: 1) partitioning the disk space into R regions, and 2) forcing the system to retrieve the block of N active requests from a single region. By reducing the worst seek time, some of the disk bandwidth is freed to retrieve additional blocks per time period, providing for a higher number of simultaneous displays (throughput). However, with a fixed amount of memory, the latency increases as the number of regions (R) is increased. Hence, it is crucial to use a planner to determine a value for the configuration parameters of a single disk multimedia server to realize a pre-specified throughput and latency time requirement. ...

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