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Achieving Page-Mapping FTL Performance at Block-Mapping FTL Cost by Hiding Address Translation

By Yang Hu, Hong Jiang, Dan Feng, Lei Tian, Shuping Zhang, Jingning Liu, Wei Tong, Yi Qin and Liuzheng Wang


Abstract--Flash Translation Layer (FTL) is one of the most important components of SSD, whose main purpose is to perform logical to physical address translation in a way that is suitable to the unique physical characteristics of the Flash memory technology. The pure page-mapping FTL scheme, arguably the best FTL scheme due to its ability to map any logical page number (LPN) to any physical page number (PPN) to minimize erase operations, cannot be practically deployed since it consumes a prohibitively large RAM (SRAM or DRAM) space to store the page-mapping table for an SSD of moderate to large size. Alternatives to the pure page-mapping FTL, such as block-mapping FTLs, hybrid FTLs (e.g., FAST) and the latest demand-based page-mapping FTLs (e.g., DFTL), require significantly less RAM space but suffer from a few performance issues. Block-mapping FTLs perform poorly with higher erasure counts, particularl

Year: 2010
OAI identifier: oai:CiteSeerX.psu:
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