2025 Volume E108.D Issue 6 Pages 629-633
As the demand for state-of-the-art solid state drive (SSD) increases, overcoming their disadvantages such as limited lifespan and asymmetric operation latency in write intensive environments becomes crucial. In this letter, we propose a hybrid disk buffer replacement policy named CLOCK with dirty page preservation (CLOCK-DPP) that manages dynamic random-access memory (DRAM) and nonvolatile memory (NVM) with separate CLOCKs to store different pages based on the operation types. By employing an additional CLOCK hand for both page eviction and migration, the CLOCK-DPP exhibited 86.62% and 47.53% larger reductions than those of existing policies in the write count of the disk buffer and block erase count of the SSD, respectively.
