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International Conference on Networking, Architecture, and storage (NAS)

作者： Huai Yang Li Chang Shen Xie Yan Liu Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

Prefetching is one of the most important method to improve storage system performance. Without knowing any I/O semantics in device layer, it is not easy now for storage system to exploit semantic information and then to prefetch the data. Many prefetching policies have to relay on simple patterns such as sequentially, temporal locality and loop references to improve storage system performance. Therefore, according to characteristic of storage system, this paper not only introduces a new sequence degree-based clustering algorithm to find the storage areas which will be accessed frequently, but also adopts ARMA time series model to forecast the storage areas on which data will be read frequently later, and their corresponding request time. Moreover, to improve the forecast accuracy, this paper adopts dynamic parameter estimation policy to ARMA model. The results of a large number of simulations validate the accuracy of the clustering algorithm and the preciseness of the ARMA time series model of dynamic parameter estimation policy, and indicate that efficiency of cache prefetching can be greatly improved through applying the clustering algorithm and ARMA time series model.

关键词： Prefetching Clustering algorithms Predictive models Cache storage system performance Parameter estimation Buffer storage Delay Laboratories data storage systems

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Application-oriented storage: Geographic information systems as an example

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Journal of Information and Computational Science 2007年第2期4卷 859-870页

作者： Zeng, Lingfang Feng, Dan Wang, Fang Tian, Lei Shi, Zhan Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

With the development of the hardware technology of computer architecture, how to utilize the computation power on the future storage device to provide high performance computation and data access has been a hot and challenging task. With more powerful CPU, future infinite capacity disk will be a supercomputer! And we should put applications close to storage objects. storage object has been proposed in the past, but its definition should be perfected. The goals of the application-based storage project are to combine and distill structured data and unstructured data into an unified model, design an understandable extension to storage object, and most importantly build a working geographic information systems (GIS) (as an application example) which integrates conventional database management and file system by an Unified storage Middleware (USM) of object-based storage system.

关键词： data storage equipment

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High Availability storage system Based on Two-Level Metadata Management

High Availability Storage System Based on Two-Level Metadata...

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Japan-China Joint Workshop on Frontier of Computer Science and Technology (FCST)

作者： Fang Wang Yinliang Yue Dan Feng Juang Wang Peng Xia Key Laboratory of Data Storage System Ministry of Education School of Computer Huazhong University of Science and Technology Wuhan Hubei China

Generally storage devices only administrate the mapping of logical data space to local physical space while unknowing other information related to data objects. Network or metadata service failure will disable the system, although the data is still on devices intact and correct. Utilizing the redundant computing ability of storage devices, the object interface makes it possible to assist the MDS for metadata services to improve the availability of the system. Though extended attributes of the object interface and computing resource, the management of the object allocation, and local metadata service are enabled in active object storage devices (A-OSD). Based on A-OSDs, a distributed high availability storage system (HASS) characterized by two-level metadata management can be built to achieve higher availability while maintaining good performance. Experiments indicate under the same environment, compared with Lustre, HASS has better write performance and similar read performance besides the potential high availability.

关键词： Availability File systems Resource management Environmental management Network servers Computer interfaces Secure storage Computer network management Project management Technology management

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SDBIA: A Novel Approach to Improve the Reading Performance of Large Objects for Object-Based storage Device

SDBIA: A Novel Approach to Improve the Reading Performance o...

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Japan-China Joint Workshop on Frontier of Computer Science and Technology (FCST)

作者： Jingning Liu Wanli Peng Fang Wang Yinliang Yue School of Computer Science and Technology Key Laboratory of Data Storage System Ministry of Education Huazhong University of Science and Technology Wuhan China

Ext2 file system is optimized for the management of small files, however, the performance of managing large files is not perfect. The Object-based storage Device of HOSS[1] (Huge Object-Based storage system, HOSS) adopts ext2 as the underlying file system, so the performance of managing large objects is limited. Two strategies to improve the reading performance of large objects in OSDs are proposed in this paper. Firstly, local relativity of data blocks on disk is utilized to reconstruct the data block index addresses as Successive data Blocks Index Array (SDBIA). SDBIA will be taken as one attribute of the object and then the performance of getting the data block index address of large objects will be improved obviously. Secondly, successive blocks allocation strategy is adopted. The experiment shows that these two strategies are effective for the performance of reading large objects.

关键词： File systems Educational technology Logic arrays Computer science Laboratories data storage systems Computer science education Performance analysis Linux data structures

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Fuzzy reliability of an iSCSI-based disk array system

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通讯和计算机（中英文版） 2007年第7期4卷 37-42页

作者： JIANG Ming-hua ZHOU Jing-li HU Ming College of Computer Science ＆ Technology Wuhan University of Science ＆ Engineering Wuhan 430073 China Key Laboratory of Data Storage System Huazhong University of Science ＆ Technology Wuhan 430074 China

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A New Method for RAID Consistency Initialization

A New Method for RAID Consistency Initialization

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International Conference on Networking, Architecture, and storage (NAS)

作者： Zhihu Tan Changsheng Xie Jiguang Wan Key Laboratory of Data Storage System Ministry of Education Huazhong University of Science and Technology Wuhan Hubei China Wuhan National Laboratory of Optoelectronics Wuhan Hubei China

When RAID volume is newly created, the data in RAID is then initialized. The process formats the RAID volume to clear any previously data and initialize redundancy information. This paper investigates others' initialization methods, and proposes a new initialization method. It makes RAID initialization and I/O request processing parallel, and reduces initialization time efficiently. Testing results reveals a moderately successful performance improvement.

关键词： Laboratories Disk drives Detectors Costs Random access memory data storage systems Educational technology Testing Process design Writing

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Fuzzy Reliability Analysis of Two-Disk Failure-Tolerant Disk Arrays

Fuzzy Reliability Analysis of Two-Disk Failure-Tolerant Disk...

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International Conference on Convergence Information Technology

作者： MingHua Jiang Jingli Zhou Ming Hu YiXiang Ding College of Computer Science &Technology Wuhan University of Science and Engineering Wuhan China Ministry of Education Key Laboratory of Data Storage System Wuhan China

ISBN: (纸本)9781424431779

This paper presents a data placement of a two-disk failure-tolerant disk arrays system, a code-mixing solution RAID5x with XOR-based code and mirror for disk arrays to improve performance of accessing storage system with high reliability. RAID5x is not only just higher in storage efficiency than other code-mixing solutions of the same type, but also it has the higher accessing performance over them and XOR-based code solutions, and then analyzed the reliability of this system by combination of fuzzy logic and Markov modeling. This reliability method is a technique for analyzing fault tolerant designs under considerable uncertainty, such as is seen in compilations of component failure rates, the presented model provides the estimation of the lower and upper boundary of a two-disk failure-tolerant disk array system with a single run of the model.

关键词： Failure analysis Redundancy Fuzzy logic Reliability engineering Performance analysis Information technology Information analysis Educational institutions Computer science Laboratories

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The system Design and Performance Analysis of WiMAX Base Station MAC Based on Intel Network Processor

The System Design and Performance Analysis of WiMAX Base Sta...

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International Conference on Networking, Architecture, and storage (NAS)

作者： Ming Wu Changsheng Xie Qingdong Wang Key Laboratory of Data Storage System Chinese Ministry of Education Computer School Huazhong University of Science슠and슠Technology Wuhan Hubei China

This paper provides WiMAX BS (base station) MAC system design and performance analysis based on Intel IXP2350, which includes MAC design key issues discussion, base station usage model and architecture, MAC hardware and software high level design with performance analysis. Especially, the WiMAX base station is user-specific, and WiMAX MAC software is one of the most important base station components, so we discuss in details about MAC data plane software design and performance pre-analysis based on IXP2350 micro engines. Current hardware GE forwarding test and data plane software pre-analysis shows that the design scheme can meet system performance requirement.

关键词： system analysis and design Performance analysis WiMAX Base stations Software performance Hardware Software design Computer architecture Engines Software testing

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Fuzzy Reliability Analysis of Distributed storage system for Tolerating Double Node and Disk Failures

Fuzzy Reliability Analysis of Distributed Storage System for...

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Workshop on Intelligent Information Technology Application

作者： MingHua Jiang Ming Hu Jingli Zhou YiXiang Ding College of Computer Science &Technology Wuhan University of Science and Engineering Wuhan China Key Laboratory of Data Storage System Ministry of Education Huazhong University of Science and Technology Wuhan China

The RAID5x is a two-disk failure-tolerant scheme of disk array that can be moved to the distributed environments. This new scheme called RAID5x variation can guarantees fault tolerance both to double node and double disk failures, there are two variations based on data distribution for placing data, parity, and mirrored copies within a periodical stripe: disk clustering and disk de-clustering. Then this paper analyzed the reliability of this system by combination of fuzzy logic and Markov modeling. This reliability method is a technique for analyzing fault tolerant designs under considerable uncertainty, such as is seen in compilations of component failure rates, the presented model provides the estimation of the lower and upper boundary of RAID5x variation with a single run of the model.

关键词： Fuzzy systems Failure analysis Fault tolerance Fuzzy logic Independent component analysis Redundancy Reliability engineering Image storage Mirrors Information technology

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Fuzzy Reliability Analysis of an iSCSI-Based Fault Tolerant storage system Organization

Fuzzy Reliability Analysis of an iSCSI-Based Fault Tolerant ...

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International Conference on Fuzzy systems and Knowledge Discovery (FSKD)

作者： MingHua Jiang Jingli Zhou Ming Hu College of Computer Science & Technology Wuhan University of Science and Engineering Wuhan China Key Laboratory of Data Storage System Ministry of Education Huazhong University of Science and Technology Wuhan China

ISCSI is a newly emerging protocol with the goal of implementing the storage area network (SAN) technology over TCP/IP, which brings economy and convenience whereas it also raises performance and reliability issues. This paper presents a implementation of iSCSTbased fault tolerant storage system, and then analyzed the reliability of this system by combination of fuzzy logic and Markov modeling. This reliability method is a technique for analyzing fault tolerant designs under considerable uncertainty, such as is seen in compilations of component failure rates, the presented model provides the estimation of the lower and upper boundary of iSCSTbased fault tolerant storage system with a single run of the model.

关键词： Fuzzy systems Fault tolerant systems storage area networks Network servers Switches Fault tolerance Local area networks Laboratories Educational technology Protocols

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