PLP-DVS: Adaptive Energy Scaling of Capacitor-Based Power Loss Protection in SSDs

초록

A capacitor-based Power Loss Protection (PLP) has been widely adopted in modern enterprise-level solid-state drives (SSD) for data security and performance. It becomes challenging to guarantee lifetime data security as SSD capacity rapidly increases in limited physical volume and cost. In this work, we proposed a dynamic control of capacitor voltage to enhance the reliability and energy efficiency of the PLP capacitors. Unlike previous studies, we reduce the voltage charged in the capacitor according to the status of the volatile contents to be protected. The proposed method is implemented in an SSD platform prototype. We successfully verified the feasibility of synchronized control of the capacitor voltage and volatile contents. The experimental result shows that the proposed method can reduce the capacitor voltage by 33% on average, corresponding to a 2.27 times longer lifetime and 41% reduction of leakage-induced energy loss. Finally, we can reduce the over-design factor by 36% of the fixed voltage setup.

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