• Title/Summary/Keyword: information storage

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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.

Fault Tolerance Enhancement for Distributed Storage Blockchain Systems (분산 저장 블록체인 시스템을 위한 효율적인 결함 내성 향상 기법)

  • Kim, Junghyun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.24 no.11
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    • pp.1558-1561
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    • 2020
  • In this paper, we propose a blockchain scheme to enhance fault tolerance in distributed storage blockchain systems. Traditional blockchain systems suffer from ever-increasing storage cost. To overcome this problem, distributed storage blockchain techniques have been proposed. Distributed storage blockchain schemes effectively reduce the storage cost, but there are still limitations in reducing recovery cost and fault tolerance. The proposed approach recovers multiple errors within a group by utilizing locally repairable codes with availability. This improves the fault tolerance of the blockchain systems. Simulation results show that the proposed scheme enhances the fault tolerance while minimizing storage cost and recovery cost compared to other state-of-art schemes.

Simulation of Storage Capacity Analysis with Queuing Network Models (큐잉 네트워크 모델을 적용한 저장용량 분석 시뮬레이션)

  • Kim, Yong-Soo
    • Journal of the Korea Society of Computer and Information
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    • v.10 no.4 s.36
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    • pp.221-228
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    • 2005
  • Data storage was thought to be inside of or next to server cases but advances in networking technology make the storage system to be located far away from the main computer. In Internet era with explosive data increases, balanced development of storage and transmission systems is required. SAN(Storage Area Network) and NAS(Network Attached Storage) reflect these requirements. It is important to know the capacity and limit of the complex storage network system to got the optimal performance from it. The capacity data is used for performance tuning and making purchasing decision of storage. This paper suggests an analytic model of storage network system as queuing network and proves the model though simulation model.

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A Study on the Use of the Web Storage HTML5 (HTML5의 Web Storage 활용에 대한 연구)

  • Lee, Kang-Keun;Choi, Jin-Young
    • Proceedings of the Korean Information Science Society Conference
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    • 2011.06b
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    • pp.430-433
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    • 2011
  • 웹브라우저에서 Cookie는 요청할 때마다 저장된 정보를 서버로 보내야 하므로 결국 응답 시간에 나쁜 영향을 미치게 되고, 저장된 모든 정보에 대해 보안에 문제가 있을 수 있다. 이 문제를 해결하기 위해 HTML5에서 제공하는 클라이언트-사이드 데이터베이스 형태의 Web Storage를 Cookie를 대체하여 사용할 수 있다. Web Storage를 활용하여 웹사이트에서 검색된 결과를 브라우저의 Local Storage에 저장하고, 저장된 내용을 이용하여 빠르게 검색하며, 네트워크 연결이 끊긴 상태에서도 이미 검색했던 데이터를 조회 하는 기능을 구현해 살펴보았다.

Fanless Thermal Design for the Information Storage System Using CAE Technique (CAE 기법을 이용한 정보저장시스템의 Fanless 열설계)

  • Ryu Ho Chul;Dan Byung Ju;Choi In Ho;Kim Jin Yong
    • 정보저장시스템학회:학술대회논문집
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    • 2005.10a
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    • pp.246-247
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    • 2005
  • This study suggested fanless thermal design using CAE technique for the information storage system under the serious thermal problem. At first, main heat flow was controlled by CAE based fanless heat sink design not to influence sensitive optical pick-up sensor. Then, vent parametric studies found a thermal solution about highly concentrated case top heat due to fanless. These CAE results were verified by experimental methods. As a consequence of newly designed thermal path, thermal specification of optical pick-up sensor was satisfied and fanless thermal design for the information storage system was achieved.

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A Disk-based Archival Storage System Using the EOS Erasure Coding Implementation for the ALICE Experiment at the CERN LHC

  • Ahn, Sang Un;Betev, Latchezar;Bonfillou, Eric;Han, Heejune;Kim, Jeongheon;Lee, Seung Hee;Panzer-Steindel, Bernd;Peters, Andreas-Joachim;Yoon, Heejun
    • Journal of Information Science Theory and Practice
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    • v.10 no.spc
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    • pp.56-65
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    • 2022
  • Korea Institute of Science and Technology Information (KISTI) is a Worldwide LHC Computing Grid (WLCG) Tier-1 center mandated to preserve raw data produced from A Large Ion Collider Experiment (ALICE) experiment using the world's largest particle accelerator, the Large Hadron Collider (LHC) at European Organization for Nuclear Research (CERN). Physical medium used widely for long-term data preservation is tape, thanks to its reliability and least price per capacity compared to other media such as optical disk, hard disk, and solid-state disk. However, decreasing numbers of manufacturers for both tape drives and cartridges, and patent disputes among them escalated risk of market. As alternative to tape-based data preservation strategy, we proposed disk-only erasure-coded archival storage system, Custodial Disk Storage (CDS), powered by Exascale Open Storage (EOS), an open-source storage management software developed by CERN. CDS system consists of 18 high density Just-Bunch-Of-Disks (JBOD) enclosures attached to 9 servers through 12 Gbps Serial Attached SCSI (SAS) Host Bus Adapter (HBA) interfaces via multiple paths for redundancy and multiplexing. For data protection, we introduced Reed-Solomon (RS) (16, 4) Erasure Coding (EC) layout, where the number of data and parity blocks are 12 and 4 respectively, which gives the annual data loss probability equivalent to 5×10-14. In this paper, we discuss CDS system design based on JBOD products, performance limitations, and data protection strategy accommodating EOS EC implementation. We present CDS operations for ALICE experiment and long-term power consumption measurement.

Design and Implementation of Storage Schema and Low-level Storage Manager for GML Documents (GML 문서 저장을 위한 저장 스키마 및 하부 저장 관리자의 설계 및 구현)

  • Chang, Jae-Woo;Kim, Young-Guk;Kim, Young-Jin
    • The KIPS Transactions:PartD
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    • v.14D no.6
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    • pp.623-632
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    • 2007
  • GML is a markup language presented as exchange standard for geographic information by the OGC(Open GIS Consortium). In spatial network databases, researches for supporting GML(Geographic Markup Language) can be divided into the parsing, the storing and the retrieval of GML documents. Among them, the study on the storage of GML documents is essential for their efficient retrieval. However there is little research on the storing of GML documents whereas there have been a lot of researches on the storing of n documents. Because the storage schema designed for XML documents are not appropriate for geographic information, we, in this paper, propose three storage schema for efficiently storing GML documents including geographic information in order to solve the problem that the XML storage schema store duplicate data and need to search many tables for obtaining elements. In addition, we design and implement a low-level storage manager which can store GML documents using the proposed GML storage schema.

Design and Implementation of Object Storage Engine for Large Multimedia Objects (대용량 멀티미디어 객체를 위한 객체저장엔진의 설계 및 구현)

  • Jin, Ki-Sung;Chang, Jae-Woo
    • Journal of KIISE:Computing Practices and Letters
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    • v.8 no.4
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    • pp.376-388
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    • 2002
  • Recently, although there are strong requirements to manage multimedia data, there are a few researches on efficient storage and retrieval of multimedia data. In this paper, we design an object storage engine which can store and retrieve various multimedia objects efficiently. For this, we design an object manager for storing a variety of multimedia data and an inverted file manager for indexing unformatted text objects. In addition, we implement the objects storage engine which can support concurrency control and recovery schemes of DBMS by integrating the object manager and the inverted file manager with the SHORE low-level storage system. Finally, we develope a TIROS(Thesis Information Retrieval using Object Storage engine) system in order to verify the usefulness of our object storage engine.

Adaptive-and-Resolvable Fractional Repetition Codes Based on Hypergraph

  • Tiantian Wang;Jing Wang;Haipeng Wang;Jie Meng;Chunlei Yu;Shuxia Wang
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.17 no.4
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    • pp.1182-1199
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    • 2023
  • Fractional repetition (FR) codes can achieve exact uncoded repair for multiple failed nodes, with lower computational complexity and bandwidth overhead, and effectively improve repair performance in distributed storage systems (DSS). The actual distributed storage system is dynamic, that is, the parameters such as node storage overhead and number of storage nodes will change randomly and dynamically. Considering that traditional FR codes cannot be flexibly applied to dynamic distributed storage systems, a new construction scheme of adaptive-and-resolvable FR codes based on hypergraph coloring is proposed in this paper. Specifically, the linear uniform regular hypergraph can be constructed based on the heuristic algorithm of hypergraph coloring proposed in this paper. Then edges and vertices in hypergraph correspond to nodes and coded packets of FR codes respectively, further, FR codes is constructed. According to hypergraph coloring, the FR codes can achieve rapid repair for multiple failed nodes. Further, FR codes based on hypergraph coloring can be generalized to heterogeneous distributed storage systems. Compared with Reed-Solomon (RS) codes, simple regenerating codes (SRC) and locally repairable codes (LRC), adaptive-and-resolvable FR codes have significant advantages over repair locality, repair bandwidth overhead, computational complexity and time overhead during repairing failed nodes.

A Physical Storage Design Method for Access Structures of Image Information Systems

  • Lee, Jung-A;Lee, Jong-Hak
    • Journal of Information Processing Systems
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    • v.14 no.5
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    • pp.1150-1166
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    • 2018
  • This paper presents a physical storage design method for image access structures using transformation techniques of multidimensional file organizations in image information systems. Physical storage design is the process of determining the access structures to provide optimal query processing performance for a given set of queries. So far, there has been no such attempt in the image information system. We first show that the number of pages to be accessed decreases as the shape of the given retrieval query region and that of the data page region become similar in the transformed domain space. Using these properties, we propose a method for finding an optimal image access structure by controlling the shapes of the page regions. For the performance evaluation, we have performed many experiments with a multidimensional file organization using transformation techniques. The results indicate that our proposed method is at least one to maximum five times faster than the conventional method according to the query pattern within the scope of the experiments. The result confirms that the proposed physical storage design method is useful in a practical way.