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energy device mapper target
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# THIS IS THE MASTER BRANCH. # About An energy-efficient device mapper target that can redirect block reads/writes to different disks (SATA, SAS, SSD, PCM, SMR) and can potentially power/spin down disks according to workload block IO characteristics. The aim is balanced trade-off among power consumption, IO performance and storage capacity by leveraging strengths of different disks. # Key idea: Data grouping by caching most frequently accessed data blocks in the most efficient disk (like SSD) to make the current device mapper green. Workloads that previously go across multiple disks can now be satisified mostly by the SSD cache, and therefore the other disks can be spin down for power benefit.