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Effects of prolonged media usage and long-term planning on archival systems

机译：长时间使用媒体和长期计划对档案系统的影响

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In archival systems, storage media are often replaced much earlier than their expected service life in exchange for other benefits of new media, such as higher capacity, bandwidth, and I/O operations per second, or lower costs. In an era of decreasing media density growth rates, retiring media early by considering only short-term benefits while discarding potential long-term cost benefits could have a negative long-term impact on an archival system's economics. To extend an archival system's life, at low cost, while limiting performance degradation, we suggest extending media lifetime past manufacturer recommendations as well as increasing the horizon for planning and provisioning future media purchases. We present a cost-benefit analysis of the impact of prolonged media usage and long-term planning. Through Monte Carlo simulation, we simulate the behavior of an archival system using tapes, hard disk drives (HDDs), solid state devices (SSDs), and Blu-ray discs. We show that leaving older media in the archival system makes economic sense for SSDs without significantly affecting reliability; we show cost improvements of approximately 10% for SSDs for a low annual media density growth rate, such as 5%, which would have been a loss of 35%, for a high annual media density rate, such as 20%. We show that, for SSDs and hard disks, the optimal planning time of an archival system is at least as long as the media service life. Combining prolonged media usage with an extended planning horizon reduced costs by 15% for a system using SSDs.
机译：在档案系统中，存储介质的更换时间通常比其预期的使用寿命要早得多，以换取新介质的其他好处，例如更高的容量，带宽和每秒的I / O操作或更低的成本。在媒体密度增长率下降的时代，仅考虑短期利益而放弃潜在的长期成本利益，尽早淘汰媒体可能会对档案系统的经济产生长期负面影响。为了以低成本延长归档系统的寿命，同时限制性能下降，我们建议延长介质寿命，使其超出制造商的建议，并增加规划和配置未来介质购买的范围。我们对长期使用媒体和长期计划的影响进行了成本效益分析。通过蒙特卡洛模拟，我们使用磁带，硬盘驱动器（HDD），固态设备（SSD）和蓝光光盘来模拟档案系统的行为。我们表明，将较旧的介质保留在归档系统中对SSD来说具有经济意义，而不会显着影响可靠性。我们显示，对于低的年度媒体密度增长率（例如5％），SSD的成本可降低约10％，而对于高的年度媒体密度增长率（例如20％），则损失了35％。我们证明，对于SSD和硬盘，归档系统的最佳计划时间至少与介质使用寿命一样长。对于使用SSD的系统，将长时间的媒体使用与扩展的规划范围相结合，可将成本降低15％。

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