GALRU: A Group-Aware Buffer Management Scheme for Flash Storage Systemsopen access
- Authors
- Kwak, Jaewook; Lee, Jungkeol; Lee, Daeyong; Jeong, Joonyong; Lee, Gyeongyong; Choi, Jungwook; Song, Yong Ho
- Issue Date
- Oct-2020
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Buffer management; flash memory; flash translation layer; flash storage system
- Citation
- IEEE ACCESS, v.8, pp.185360 - 185372
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE ACCESS
- Volume
- 8
- Start Page
- 185360
- End Page
- 185372
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/7920
- DOI
- 10.1109/ACCESS.2020.3030089
- Abstract
- Many flash storage systems divide input/output (I/O) requests that require large amounts of data into sub-requests to exploit their internal parallelism. In this case, an I/O request can be completed only after all sub-requests have been completed. Thus, non-critical sub-requests that are completed quickly do not affect I/O latency. To efficiently reduce I/O latency, we propose a buffer management scheme that allocates buffer space by considering the relationship between the processing time of the sub-request and I/O latency. The proposed scheme prevents non-critical sub-requests from wasting ready-to-use buffer space by avoiding the situation in which buffer spaces that are and are not ready to use are allocated to an I/O request. To allocate the same type of buffer space to an I/O request, the proposed scheme first groups sub-requests derived from the same I/O request and then applies a policy for allocating buffer space in units of sub-request groups. When the ready-to-use buffer space is insufficient to be allocated to the sub-request group being processed at a given time, the proposed scheme does not allocate it to the sub-request group but it instead sets it aside for future I/O requests. The results of the experiments to test the proposed scheme show that it can reduce I/O latency by up to 24% compared with prevalent buffer management schemes.
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