A Survey of Near-Line Storage Technologies: Devices and Systems
نویسندگان
چکیده
With the advent of multi-media and other applications that require the incorporation of large amounts of digital data, the need for a new level in the storage hierarchy has arisen. This new storage level is called Near-Line Storage, and is de ned as an intermediate stage between traditional on-line and o -line storage levels. The goal of this paper is to provide a detailed survey for computer scientists about the device and systems technologies for building near-line storage systems. We rst give a taxonomy of near-line storage devices according to their recording media and recording mechanisms, together with in-depth discussions of the devices' cost/performance characteristics. Greater emphasis is placed on magnetic and optical storage devices since they currently represent the technology of choice. Wherever possible, the architectural implications of particular technology/con guration parameters of these devices are investigated in detail. We then discuss existing and/or proposed organization concepts for constructing near-line storage systems. The design and implementation tradeo s for each of these approaches are examined and compared from a computer architect's standpoint.
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