| 摘要 |
<p>A storage system (100) such as a video on demand system, comprising a plurality of storage units (110-120) such as disk drives. Each one of the storage units (110-120) has a number of storage zones (121-126) with mutually different expected data retrieval times. Data is stored in data units, with each data unit comprising N blocks, wherein N≥2. The blocks of a data unit are distributed over the storage units (110-120). The blocks comprise redundant information such that any one of a plurality of selections comprising N-K of the N blocks suffices for retrieving the data unit, wherein K≥1. For retrieving a data unit from the storage units (110-120), a reader determines which N-K of the N blocks to retrieve on the basis of a selection procedure. The selection procedure takes into account the expected data retrieval times in order to optimize bandwidth utilization.</p> |
