A Survey of Techniques for Architecting SLC/MLC/TLC Hybrid Flash Memory based SSDs

Ahmed I Alsalibi, Sparsh Mittal, Mohammed Azmi Al-betar and Putra Bin Sumari
Israa University
Concurrency and Computation: Practice and Experience, 2018


   title={A Survey of Techniques for Architecting SLC/MLC/TLC Hybrid Flash Memory based SSDs},


   author={Ahmed I Alsalibi and Sparsh Mittaland Mohammed Azmi Al-betarand Putra Bin Sumari},

   journal={Concurrency and Computation: Practice and Experience}


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Flash memory based SSDs offer several attractive features and benefits compared to hard disk drive (HDD), such as shock resistance, better performance especially for random data access, etc. Depending on the number of bits in each cell, Flash memory can be designed as single/multi/triple level cell (SLC/MLC/TLC) which have different performance, density, cost and write endurance characteristics. To bring the best of these together, several researchers have proposed designing solid state drive (SSD) using hybrid SLC/MLC/TLC Flash memory. However, these SSDs also present several challenges such as buffer management, placement of hot/cold data in suitable portion, intelligent garbage collection, etc. Several recent techniques aim to address these challenges. In this paper, we present a survey of techniques for managing SSDs designed with SLC/MLC/TLC Flash memory. We classify the works on several axes to bring out their similarities and differences. We aim to synthesize the state-of-art progress in hybrid SSD management and also spark further research in this area.
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