Abstract
Integrating solid-state drives (SSDs) and shingled magnetic recording (SMR) drives can build cost-effective hybrid storage systems. However, both SSD and SMR drives endure inherent defects that are mutually exclusive. The write endurance of SSD is limited while SMR drives should prevent from writes due to the cleaning-caused performance degradation. In this paper, we propose Duchy, an endurable SSD caching scheme that simultaneously respects SMR constraints. Duchy filters ineffectual write traffic out of SSD without exacerbating the performance degradation of SMR drives. Meanwhile, Duchy leverages SSD to regulate the written zones in SMR drives to achieve controllable cleaning duration. Our experimental results indicate that compared with legacy SSD caching designs, only Duchy can achieve both system performance improvement and SSD write traffic reduction.
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