FSAF: File System Aware Flash Translation Layer for NAND Flash Memories

Provided by: edaa
Topic: Storage
Format: PDF
NAND Flash Memories require Garbage Collection (GC) and Wear Leveling (WL) operations to be carried out by Flash Translation Layers (FTLs) that oversee flash management. Owing to expensive erasures and data copying, these two operations essentially determine application response times. Since file systems do not share any file deletion information with FTL, dead data is treated as valid by FTL, resulting in significant WL and GC overheads. In this paper, the authors propose a novel method to dynamically interpret and treat dead data at the FTL level so as to reduce above overheads and improve application response times, without necessitating any changes to existing file systems.

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