• Title/Summary/Keyword: 레이드

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A Fast Parity Resynchronization Scheme for Small and Mid-sized RAIDs (중소형 레이드를 위한 빠른 패리티 재동기화 기법)

  • Baek, Sung Hoon;Park, Ki-Wong
    • KIPS Transactions on Computer and Communication Systems
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    • v.2 no.10
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    • pp.413-420
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    • 2013
  • Redundant arrays of independent disks (RAID) without a power-fail-safe component in small and mid-sized business suffers from intolerably long resynchronization time after a unclean power-failure. Data blocks and a parity block in a stripe must be updated in a consistent manner, however a data block may be updated but the corresponding parity block may not be updated when a power goes off. Such a partially modified stripe must be updated with a correct parity block. However, it is difficult to find which stripe is partially updated (inconsistent). The widely-used traditional parity resynchronization manner is a intolerably long process that scans the entire volume to find and fix inconsistent stripes. This paper presents a fast resynchronization scheme with a negligible overhead for small and mid-sized RAIDs. The proposed scheme is integrated into a software RAID driver in a Linux system. According to the performance evaluation, the proposed scheme shortens the resynchronization process from 200 minutes to 5 seconds with 2% overhead for normal I/Os.

A Study on the Construction of Status Display Equipment for Soft-RAID System of Linux Server using Hardware (하드웨어에 의한 리눅스 서버 소프트-RAID 시스템의 상태표시 장치 구성에 관한 연구)

  • Na, Won-Shik;Lee, Hyun-Chang
    • Journal of Software Assessment and Valuation
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    • v.15 no.2
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    • pp.95-100
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    • 2019
  • In this paper, we propose a simple hardware reporting method for errors in soft-RAID systems of Linux OS. Compared with other reporting methods, the proposed method displays error status intuitively without any additional access process such as log-in process or home-page access. In particular, the server actively displays the error status, so the administrator can take immediate action. In order to confirm the effectiveness of the proposed method, the experimental circuit was constructed and the experimental results showed that the error was actively displayed when an error occurred in the storage device. As such, a soft-RAID system can perform almost the same function as a hardware RAID system, thereby ensuring server data reliability at low cost.

Selection of adsorbents for recovery VOC in HVRS (아세톤 회수를 위한 HVRS 공정의 흡착제 선정)

  • 안창덕;김흥익;나영수;윤영삼
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2002.11a
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    • pp.411-412
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    • 2002
  • 현재 많은 산업현장에서 휘발성 유기용제를 사용하고 있다. 국내 환경부에서 규제대상 VOC로 고시하고 있는 물질(환경부고시, '98. 7.1.)은 레이드 증기압, 광화학반응성, 물질사용량, 발암성 등 유해성을 감안하여 31개를 선정하여 규제하고 있으며 앞으로 규제대상 물질을 점차로 확대하여 나갈 계획으로 있다. 이에 한정된 자원의 고갈을 방지하고 환경의 보존을 위해 공정상에서 유기용제의 사용을 대체하는 것이 가장 이상적이나, 현재의 여건으로는 맡은 시간이 소요되므로 효율적인 휘발성 유기용제 처리공정 개발이 시급한 실정이다. (중략)

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A Study on Hetero-RAID Scheme for Hybrid Storage Systems (하이브리드 저장 시스템을 위한 헤테로-레이드 기법에 대한 연구)

  • Byun, Si-Woo;Hur, Moon-Hang
    • Proceedings of the KAIS Fall Conference
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    • 2010.05a
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    • pp.176-178
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    • 2010
  • 본 논문에서는 전통적인 RAID-1 미러링에 기반을 둔 헤테로-미러링이라는 하는 새로운 저장 장치 관리 기법을 제안한다. 헤테로-미러링 기반의 스토리지 관리는 SSD에서 발생 가능한 프리징 현상을 피하기 위한 쓰기-부하 밸런싱과 쓰기 지연 연산을 통하여 RAID-1 처리 성능을 개선한다.

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A study on the Construction of Remote Status Display Software for Soft-RAID system of Linux based Server (리눅스 기반 서버의 소프트-RAID 시스템용 원격 상태 표시 소프트웨어의 구성에 관한 연구)

  • Na, Won-Shik;Lee, Hyun-Chang
    • Journal of Software Assessment and Valuation
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    • v.15 no.1
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    • pp.97-102
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    • 2019
  • In this paper, we propose a method to remotely intuitively identify faults found in storage devices in soft-RAID used in a server system composed of Linux. To do this, we analyze the principle and problem of fault reporting method in the soft-RAID system of Linux OS and suggest the state of storage devices in remote Internet Home-page. The proposed method consists of a method of displaying images on the Internet home-page, so that it can be arranged freely when creating a home-page, and the image data is composed of external files, so it is bery convenient to edit and replace images In order to verify the effectiveness of the proposed method, we have confirmed that the state of each storage device can be confirmed at a long distance without any major addition to the Home-page configuration.

Synthesis of CuInSe2 Thin Film by Non-vacuum Precursor Coating and Oxidation Treatment

  • Lee, Dong-Uk;Yong, Gi-Jung
    • Proceedings of the Korean Vacuum Society Conference
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    • 2011.02a
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    • pp.400-400
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    • 2011
  • 조성에 따른 밴드갭 조절이 용이하고 광흡수율이 결정질, 비결정질 실리콘보다 높으며 황동광 구조를 갖는 CuIn1-xGaxSe2 계 물질은 박막형 태양전지의 광흡수층으로 널리 쓰이고 있다. 기존 동시증발법, 스퍼터링법 등 진공 공정 기반 기술이 갖는 고비용 문제와 대면적화 필요성에 대한 대안으로 비진공 박막 증착법이 활발히 연구되고 있는 가운데, 본 연구에서는 닥터블 레이드 코팅법을 이용하여 상온 및 상압 환경에서 쉽게 전구체 박막을 코팅한 후 열처리함으로써 CuInSe2 박막을 얻을 수 있었다. 고분자로 이루어진 바인더(binder) 물질과 금속 아세테이트 (metal acetate)계 전구체를 용매에 용해시킨 후 이를 도포하고, 추가적인 산화 열처리 과정 (oxidation)을 통해 최근 문제가 되고 있는 잔류탄소층 문제를 해결할 수 있었다. XRD 분석 결과, 금속 전구체들은 산화 과정 통해 금속산화물로 변환되고, 이후 셀렌화(Selenization)과정에서 산소(Oxygen)가 셀레늄(Selenium)으로 치환되는 반응이 일어나는 것으로 관찰되었다. 또한 SEM 분석을 통해 잔류 탄소층이 존재하지 않으며 결정립 크기가 최대 수백nm 정도임을 확인하였다.

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A Design of RAID-1 Storage using Hard Disk Drive and Flash Memory Drive (하드 디스크 드라이브와 플래시 메모리 드라이브를 활용한 레이드-1 저장장치의 설계)

  • Byun, Si-Woo
    • Transactions of the Society of Information Storage Systems
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    • v.6 no.2
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    • pp.41-46
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    • 2010
  • Recently, Flash Memory Drives are one of the best media to support portable and desktop computers' storage devices. Their features include non-volatility, low power consumption, and fast access time for read operations, which are sufficient to present flash memories as major database storage components for desktop and server computers. However, we need to improve traditional storage management schemes based on HDD(Hard Disk Drive) and RAID(Redundant Array of Independent Disks) due to the relatively slow or freezing characteristics of write operations of SSDs, as compared to fast read operations. In order to achieve this goal, we propose a new storage management scheme called Hetero-Mirroring based on traditional HDD mirroring scheme. Hetero-Mirroring-based storage management improves RAID-1 operation performance by balancing write-workloads and delaying write operations to avoid SSD freezing.

Performance Evaluation of Big Stream based High Speed Data Storage (빅 스트림 기반 초고속 데이터 스토리지 성능 평가)

  • Song, Min-Gyu;Kang, Yong-Woo;Kim, Hyo-Ryoung
    • The Journal of the Korea institute of electronic communication sciences
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    • v.12 no.5
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    • pp.817-828
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    • 2017
  • It is very hard to find the system which processes single 10Gbps stream, and the related application is also rare. But in the field of science such as physics and astronomy, these high speed systems have been widely used and now more upgraded performance is expected. For this reason, high speed network based storage which captures and records 10Gbps level of packets was developed for the support of small astronomical company in KASI. But for the use of the system in research, system performance should be not only evaluated but also optimized. In this paper, we first implement system environment for the performance evaluation and discuss the experiment procedure and solution to acquire numerical results.