Wear leveling in SSDs considered harmful
Wear leveling in SSDs considered harmful
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DOI：
10.1145/3538643.3539750
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Ziyang Jiao;J. Bhimani;B. Kim
中科院分区：
文献类型：
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作者：
Ziyang Jiao;J. Bhimani;B. Kim
我们认为，在现代环境下，SSD的磨损均衡弊大于利，因为现代环境的耐力极限是数百。为了支持这一主张，我们评估现有的磨损均衡技术，并表明它们表现出异常的行为，并产生高的写入放大。这些发现与最近对固态硬盘的操作特性进行的大规模实地研究相一致。我们讨论了在SSD中放弃磨损均衡而采用容量方差的选项，并表明容量方差将SSD的寿命延长了2.94倍。
We argue that wear leveling in SSDs does more harm than good under modern settings where the endurance limit is in the hundreds. To support this claim, we evaluate existing wear leveling techniques and show that they exhibit anomalous behaviors and produce a high write amplification. These findings are consistent with a recent large-scale field study on the operational characteristics of SSDs. We discuss the option of forgoing wear leveling and instead adopting capacity variance in SSDs, and show that the capacity variance extends the lifetime of the SSD by up to 2.94×.