JICCE (한국정보통신학회)
Current Result Document : 4 / 5
| 한글제목(Korean Title) |
Write Request Handling for Static Wear Leveling in Flash Memory (SSD) Controller |
| 영문제목(English Title) |
Write Request Handling for Static Wear Leveling in Flash Memory (SSD) Controller |
| 저자(Author) |
Chang Choo
Pooja Gajipara
Il-Young Moon
|
| 원문수록처(Citation) |
VOL 12 NO. 03 PP. 0181 ~ 0185 (2014. 09) |
한글내용
(Korean Abstract) |
|
영문내용
(English Abstract) |
The lifetime of a solid-state drive (SSD) is limited because of the number of program and erase cycles allowed on its NAND flash blocks. Data cannot be overwritten in an SSD, leading to an out-of-place update every time the data are modified. This result in two copies of the data: the original copy and a modified copy. This phenomenon is known as write amplification and adversely affects the endurace of the memory. In this study, we address the issue of reducing wear leveling through efficient handling of write requests. This results in even wearing of all the blocks, thereby increasing the endurance period. The focus of our work is to logically divert the write requests, which are concentrated to limited blocks, to the less-worn blocks and then measure the maximum number of write requests that the memory can handle. A memory without the proposed algorithm wears out prematurely as compared to that with the algoritm, The main feature of the proposed algorithm is to delay out-of-place updates till the threshold is reached, which results in a low overhead. Further, the algorithm increases endurance by a factor of the threshold level multiplied by the number of blocks in the memory.
|
| 키워드(Keyword) |
dynamic wear leveling
flash memory
solid-state drive
static wear leveling
|
| 파일첨부 |
PDF 다운로드
|
