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《Journal of Zhejiang University(Engineering Science)》 2014-01
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Log-structured even recycle strategy for flash storage

CHEN Zhao;YU Feng;CHEN Ting-ting;Department of Instrumentation Science and Engineering,Zhejiang University;  
Some factors,like out-of-place write and limited erasure lifecycles,pose reliability challenge for flash storage.A novel recycle scheme,called senior-block-first recycle method(SBFR),was proposed for log-structured flash management in order to mitigate the problem.In order to extend the functional lifetime,the flash management must utilize blocks evenly and lower space-reclamation overhead at the same time,and has to avoid the confliction of these two objectives.SBFR tended to collect and assemble scattered cold data.Utilization-ratio and seniority-degree were taken as the selection criterions for block recycle.A forced wear-leveling mechanism was incorporated into the recycle method with little overhead.Experimental results indicate that SBFR method can effectively prolong flash's functional life-time by leveling erase counts of all blocks evenly with small recycle overhead.
【CateGory Index】: TP333
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