• Journal of KIISE:Computer Systems and Theory
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• v.36 no.3
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• pp.171-180
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• 2009

Slowly, but surely, we are seeing the emergence of a variety of embedded systems that are employing Storage Class RAM (SCRAM) such as FeRAM, MRAM and PRAM, SCRAM not only has DRAM-characteristic, that is, random byte-unit access capability, but also Disk-characteristic, that is, non-volatility. In this paper, we propose a new software architecture that allows SCRAM to be used both for main memory and for secondary storage simultaneously- The proposed software architecture has two core modules, one is a SCRAM driver and the other is a SCRAM manager. The SCRAM driver takes care of SCRAM directly and exports low level interfaces required for upper layer software modules including traditional file systems, buddy systems and our SCRAM manager. The SCRAM manager treats file objects and memory objects as a single object and deals with them in a unified way so that they can be interchanged without copy overheads. Experiments conducted on real embedded board with FeRAM have shown that the SCRAM driver indeed supports both the traditional F AT file system and buddy system seamlessly. The results also have revealed that the SCRAM manager makes effective use of both characteristics of SCRAM and performs an order of magnitude better than the traditional file system and buddy system.

• Communications of the Korean Institute of Information Scientists and Engineers
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• v.27 no.5
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• pp.18-28
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• 2009

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.77-78
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• 2013

최근 비휘발성, 바이트 단위 접근이 가능한 스토리지 클래스 메모리 관련 시스템 소프트웨어 연구가 활발히 이루어지고 있다. 이에 본 논문에서는 SCM의 성능 및 용량, 가격 측면을 고려하여, NAND 스토리지 시스템 성능 향상을 위한 변화량 기반 저널링 기법을 제안한다. 본 기법은 기존 데이터 대비 바뀐 부분이 임계치보다 작을 경우, 해당 부분을 기록하는 저널 영역으로써 SCM을 활용한다. 분석 결과에서 알 수 있듯이 본 논문에서 제안한 기법은 NAND 페이지 쓰기 횟수를 크게 감소시킴으로써, I/O 성능 및 NAND 스토리지 수명 향상을 가져온다.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.47 no.5
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• pp.35-40
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• 2010

NAND flash memory has been widely used than traditional HDD in PDA and other mobile devices, embedded systems, PC because of faster access speed, low power consumption, vibration resistance and other benefits. DiskSim and other HDD simulators has been developed that for find improvements for the software or hardware. But there is a few Linux-based simulators for NAND flash memory and SSD. There is necessary for Windows-based NAND flash simulator because storage devices and PC using Windows. This paper describe for development of simulator-NFSim for FTL performance analysis in NAND flash. NFSim is used to measure performance of various FTL algorithms and FTL wear-level. NAND flash memory model and FTL algorithm developed using Windows Driver Model and class for scalability. There is no need for another tools because NFSim using graph tool for data measure of FTL performance.