Keywords: embedded systems, flash memory, solid state drives, data de-duplication, storage systems
Received May 31, 2011; accepted March 31, 2012.
Communicated by Jiman Hong, Junyoung Heo and Tei-Wei Kuo.
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CHIN-HSIEN WU AND HAU-SHAN WU
Department of Electronic Engineering
National Taiwan University of Science and Technology
Taipei, 106 Taiwan
E-mail: {chwu; m9702116}@mail.ntust.edu.tw
With the rapid development of SSDs (Solid State Drives), traditional hard drives in
many applications have been replaced by SSDs. Since SSDs consist of NAND flash
memory, the main challenge to SSDs is that NAND flash memory is highly sensitive to
write requests. A lot of write requests will cause garbage collection to reclaim free space
due to the ¡§out-place update¡¨ characteristic of flash memory. Frequent activities of garbage
collection will reduce the lifetime of flash memory and overall performance. When
SSDs are used for data storage, how to significantly decrease the amount of data written
will become an important topic. In the paper, we will propose a data de-duplication access
framework for SSDs. The objective is to eliminate duplicate data as much as possible
and reduce space consumption. We will combine a file-based de-duplication and a
static chunking de-duplication scheme to reach a complete data de-duplication. We will
also investigate application-based locality and file-name locality to find out duplicate
data. According to the experimental results, the proposed framework can efficiently
identify duplicate data and decrease a lot of data written, and at the same time, the overhead
is also reasonable.
Received May 31, 2011; accepted March 31, 2012.
Communicated by Jiman Hong, Junyoung Heo and Tei-Wei Kuo.