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Update on Large NAND Flash File System Evaluation

Toru Homma, Toshiba

NAND flash memories are commonly used in embedded systems. JFFS2 has been widely used as one of the flash file systems, but there are some other choices in case NAND device becomes larger, such as more than 128MB. We have defined the flash memory related system requirements such as boot time, I/O performance, memory usage, life time, and the tolerance for unexpected power loss. And then we have broken them down into the flash file system benchmark items like the mount time, the I/O performance, wear leveling, and the tolerance for unexpected power loss. In ELC2009, we have proven that UBIFS is one of the best in general and the other file systems can fit depending on the system requirements. In this presentation, we will talk more about UBIFS and update the information. Expected audiences are those who are interested in flash file systems, embedded system developers and testers.