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Due to recent advances in semiconductor technologies, Storage Class RAMs (SCRAMs) such as FRAM and PRAM are emerging rapidly. Since SCRAMs are nonvolatile and byte-accessible, there are attempts to use these SCRAMs as part of nonvolatile buffer caches. A nonvolatile buffer cache provides improved consistency of file systems by absorbing write I/Os as well as improved performance. In this paper, the authors discuss the optimality of cache replacement algorithms in nonvolatile buffer caches and present a new algorithm called NBM (Nonvolatile-RAM-aware Buffer cache Management).
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