CFTL: A Convertible Flash Translation Layer With Consideration of Data Access Patterns

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Executive Summary

NAND flash memory-based storage devices are increasingly adopted as one of the main alternatives for magnetic disk drives. The Flash Translation Layer (FTL) is a software/hardware interface inside NAND flash memory, which allows existing disk-based applications to use it without any significant modifications. Since FTL has a critical impact on the performance of NAND flash-based devices, a variety of FTL schemes have been proposed to improve their performance. However, existing FTLs perform well for either a read intensive workload or a write intensive workload, not for both of them due to their fixed and static address mapping schemes.

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