Researchers at Chuo University develop technologies for 4 times faster and 60% energy savings that can be applied immediately to current SSD


ByAnthony Lin

A research group of Chuo UniversitySolid state drive (SSD)We developed a technology that makes 60% energy saving while quadrupling the write speed of. This new technology is technology that can be applied immediately to the current SSD.

Technology to speed up SSD by suppressing the influence of data fragmentation, Chuo University developed - Semiconductor device - Nikkei Technology Online
http://techon.nikkeibp.co.jp/article/NEWS/20140519/352641/

Chuo College SSD speed-up technology, write speed 4 times: Nihon Keizai Shimbun
http://www.nikkei.com/article/DGXNASFK2102Y_R20C14A5000000/

International conference on semiconductor memory technology "2014 IEEE 6th International Memory Workshop (IMW), Chuo University, Faculty of Science and Technology, Department of Electrical and Electronic Information and Communication EngineeringTakeshi TakeuchiProfessor's research group is a function to automatically release unnecessary memory areasGarbage CollectionBy drastically reducing the amount of data copying at the factory, we announced a new technology that can achieve high speed, long life, and energy saving.

In SSD, data can not be overwritten in the same memory area, data is written to another memory area, data is fragmented in the mechanism of invalidating the old memory area, and the writing speed greatly decreases, so this is called To prevent this, many current SSDs have garbage collection function to erase invalid area on a block basis, but there are plenty of garbage collection functions requiring hundreds of milliseconds for garbage processing, so the problem of low writing speed had.

In the new technology developed by Professor Takeuchi's group, middleware "SE (storage engine)" that allocates logical addresses when accessing SSD from the application software side by devising middleware that controls storage for database applications, "And the middleware" FTL (flash translation layer) "that translates the logical address to the physical address on the SSD controller side works in cooperation to prevent data fragmentation.


Specifically, rather than writing data on a fresh new page, you can efficiently use the page by writing data to a fragmented page in the next block to be erased, and the page amount to be copied during garbage collection That is to reduce.

By using this new technology, it has been confirmed that the writing speed of the SSD is up to 4 times faster than the conventional speed, the number of times of rewriting is reduced by 55% to realize a long life, and the energy consumption is also reduced by 60% He said that.


Since this new technology is a technology completed at the middleware level where no change is made to the NAND flash memory, it can be applied immediately to the current SSD so that the performance of the SSD will be greatly raised soon It is likely to become.

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