Move-On-Modify: An Efficient yet Crash-Consistent Update Strategy for Interlaced Magnetic Recording
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Embedded Memory, Storage and Networking
DescriptionInterlaced Magnetic Recording (IMR) technology delivers higher areal density for hard drives by interlacing tracks. However, to update the interlaced tracks overlapped by valid data, IMR must entail extra I/Os to rewrite tracks, and the typical read-modify-write (RMW) update strategy further amplifies extra I/Os and deteriorates write performance for ensuring crash consistency. In contrast to the state-of-the-art designs that focus on reducing the occurrence of RMW(s), this paper presents a novel efficient-yet-crash-consistent update strategy, namely move-on-modify (MOM), to completely substitute the RMW. Evaluation results show that MOM effectively boosts write performance via minimizing extra I/Os and benefits the state-of-the-art designs.