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检索条件"机构=Key Laboratory of Data Storage System"

共 131 条记录，以下是61-70 订阅

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Study and Optimize the Process of Batch Small Files Replication

Study and Optimize the Process of Batch Small Files Replicat...

引用

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

作者： Liang Xiao Qiang Cao Changsheng Xie Chuanwen Wu Key Laboratory of Data Storage System Ministry of Education Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan China

I/O performance is always the traditional criterion for the evaluation of storage system. Many researches have been being carried on how to improve the storage system performance, mainly focusing on the storage architecture and I/O optimization for the storage devices. In many application systems, the phenomenon of replicating batch small files between two locations widely exists and always represents poor performance in systems. This paper analyzes and optimizes replication process for batch small files in Linux file system. In local case, six algorithms are achieved by using parallel, consecutive and aggregating polices in different stages of the whole process. In network case, achieve and compress strategies are also introduced and compared with aggregating algorithm. Moreover, the average latency of basic operations in each stage of file I/O can be estimated accurately, which is helpful for future research of file system. The experiment shows that the algorithm of consecutive reading source files and parallel writing target files have the best performance in local replication, and aggregating algorithm also do in network replication.

关键词： Delay File systems Educational technology data communication system performance Computer science data storage systems Computer science education Application software Geography

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Hybrid RAID-tape-library storage system for backup

Hybrid RAID-tape-library storage system for backup

引用

International Conference on Embedded Software and systems

作者： Lingfang Zeng Dan Feng Fang Wang Ke Zhou Peng Xia Key Laboratory of Data Storage System Ministry of EducationSchool of Computer Huazhong University of Science and Technology Wuhan China

Traditional tape back-up systems have begun to wear out their welcomes in some businesses, which are turning to the virtual tape technologies. The virtual tape technologies combine the traditional backup methodology with the disk drive technology to create a disk-based library that acts as a tape library. In concert with the traditional backup software from vendors, the virtual tape libraries write data to a disk in current tape formats. Because the disk is used rather than tape, data can be backed up at channel speeds many times faster than with a tape and also recovered more quickly. This paper provided a new hybrid storage appliance: the RAID-tape-library, which makes the customary backup software behave performance and other features of the tape drives. And this hybrid storage device is not like the traditional software-based or hardware-based virtual tape library (VTL), which separates the tape library and the disk, our implementation is as an independent appliance that supports the backup application and the ultra SCSI attachments. It is similar to a disk device, but it does have abundance storage capacity like a tape library. With this hybrid device, the time of mount, position and dismount tapes is overlapped by effectual data transport in a RAID. The result of simulation shows the hybrid storage device has preferable performance.

关键词： Software libraries Microwave integrated circuits Educational technology Home appliances Application software data storage systems Computer science education Business communication Turning Disk drives

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FTRAID: A Fat-tree Based Parallel storage Architecture for Very Large Disk Array

FTRAID: A Fat-tree Based Parallel Storage Architecture for V...

引用

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

作者： Zhikun Wang Ke Zhou Dan Feng Lingfang Zeng Junping Liu School of Computer Key Laboratory of Data Storage System Ministry of Education Huazhong University of Science and Technology Wuhan China

Traditional disk arrays have a centralized architecture, with a single controller through which all requests flow. Such a controller is a single point of failure, and its performance limits the maximum number of disks to which the array can scale. Fat-trees are well-adopted as the topologies of interconnection networks because of many nice properties they have. We propose a novel fat-tree based parallel RAID architecture - FTRAID. The unit of deployment in FTRAID is a storage node, a small rack-mounted storage appliance built from commodity components including CPU, RAM, NIC and disks. We also establish stochastic Petri net (SPN) model of storage node to analyze its utilization. In particular we have designed and implemented a seven node FTRAID prototype to demonstrate its feasibility. Numerical results using popular benchmark have shown good performance gain.

关键词： Computer architecture Bandwidth Tin Multiprocessor interconnection networks Read-write memory Stochastic processes Redundancy Hardware Aggregates Concurrent computing

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FPGA/ASIC based Cryptographic Object Store system

FPGA/ASIC based Cryptographic Object Store System

引用

International Symposium on Information Assurance and Security (IAS)

作者： Dan Feng Lanxiang Chen Lingfang Zeng Zhongying Niu Key Laboratory of Data Storage System Ministry of Education School of Computer Huazhong University of Science and Technology Wuhan China

avoid re-encryption in cryptographic storage system when revoking users, Field Programmable Gate Array (FPGA) and Application Specific Integrated Circuit (ASIC) hardware module have been introduced to a cryptographic object store system, let private key never leave the hardware module and symmetric key only exist in hardware module in plaintext. Anyone doesn 7 know private or symmetric key, so when revoking users, it just needs to modify access control list (A CL) to delete the privileges of the users. To facilitate file sharing and key management, group is adopted. In our system, almost all computationally expensive cryptographic operations are through FPGA/ASIC hardware module. Once creator revokes some users, objects don't need re- encryption. How to use ACL and FPGA/ASIC hardware module to authenticate and authorize are described. And the procedure of object store and the distribution of meta-data are detailed. Finally, a cryptographic object store prototype system is implemented with tested and effective performance.

关键词： Field programmable gate arrays Application specific integrated circuits Cryptography Hardware File systems Peer to peer computing data security Secure storage Information security Delay

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SOSS: smart object-based storage system

SOSS: smart object-based storage system

引用

International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Ling-Fang Zeng Dan Feng Ling-Jun Qin Key Laboratory of Data Storage System Ministry of Education School of Computer Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)0780384032

Hints for storage system come from three aspects: the first is in combination with accurate file or directory attribute layout. The second is from existing file system and depends on user input. The third is from file content analysis. However in the SOSS (smart object-based storage system), object, a new fundamental storage component different from traditional storage unit (file or block), is introduced, and object provides ample hints for storage system, which can help with designing more intelligent (or smarter) storage system. This paper gives a brief introduction about SOSS, and some methods adopted in SOSS to achieve intelligence, such as pattern recognition method, predicting object properties method and an adaptive cache replacement policy (all are based on object attribute), are studied.

关键词： Pattern recognition Intelligent networks Fabrics storage automation File systems Laboratories data storage systems Computer science education Educational technology Cache storage

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DOIDFH: an Effective Distributed Metadata Management Scheme

DOIDFH: an Effective Distributed Metadata Management Scheme

引用

International Conference on Computational Science and its Applications (ICCSA)

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

Subtree partitioning and hashing are two common techniques used for current distributed metadata management schemes. Subtree partitioning schemes do not evenly distribute workload among metadata server cluster, and a number of metadata need to be migrated to achieve coarse load balancing. Though current hashing schemes evenly distribute workload among metadata server cluster, they eliminate the storage locality of files metadata in the same directory. They also can not effectively deal with some operations such as renaming a directory or accessing a file in the path of a linked directory. A new approach called parent Directory Object Identifier and Filename Hashing (DOIDFH) metadata management is proposed, which could distribute evenly files metadata among metadata server cluster, as well as partially hold hierarchical locality. It solves effectively the existent problems of current hashing schemes and also takes advantages of them.

关键词： Distributed computing Conference management Technology management File servers Prototypes File systems system performance Computer applications Application software Laboratories

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An Active Region-based storage Mechanism in Large Wireless Sensor Networks

An Active Region-based Storage Mechanism in Large Wireless S...

引用

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

作者： Xiongzi Ge Dan Feng Lei Tian Key Laboratory of Data Storage System Ministry of Education College of Computer Huazhong University of Science and Technology Wuhan China

Providing efficient and robust storage service in large sensor networks is critical and challenging. In this paper, an active region-based storage (ARS) mechanism is proposed to accommodate the dynamic data-access behaviors and mutable external environments, where solar intensity which energy producing depends on changes dynamically. The ARS divides the whole network into geographical regional sub-networks, each of which contains sensor nodes and storage nodes, handled by an intelligent agent. storage nodes are responsible for storing and forwarding data collected, while agents, aware of the change of energy and service, make transitions of the global data distribution dynamically to ensure robust service. Moreover, strategies of ARS also take account of node mobility and resilience to node failure. To evaluate the applicability to the dynamic and complicated external behaviors of ARS, the whole system is modeled and simulated, and the results indicate that ARS mechanism can achieve energy equalization and long-term steady service.

关键词： Wireless sensor networks Energy storage Computer networks Robustness Temperature sensors Resilience Analytical models Laboratories data storage systems Computer science education

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PMSH: a new algorithm for RAID data migration based on stripe unit heat

PMSH: a new algorithm for RAID data migration based on strip...

引用

International Conference on Machine Learning and Cybernetics (ICMLC)

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

Traditional RAID has the characteristics that location of stripe unit in each disk is stochastic and static, and that the outer zone of the disk has higher data transfer rate as compared to the inner one. Facing this situation, to exploit RAID I/O performance fully, this paper proposes a new algorithm PMSH (placement and migration based on stripe unit heat) for RAID stripe unit data to be placed optically and migrate dynamically. Based on the heat of RAID stripe unit, PMSH keeps migrating the frequently accessed stripe unit to the disk zone with higher data transfer rate, thus optimize the location of data in RAID disks, and make the data distribution adapt to the evolution of file access pattern dynamically as well. Simulation results demonstrate significant RAID I/O performance improvement using PMSH.

关键词： File systems Heat transfer Disk drives Disk recording Angular velocity Performance analysis Laboratories data storage systems Computer science Stochastic systems

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The approximate parameters analysis of mS/spl ***/RAID

引用

International Conference on Machine Learning and Cybernetics (ICMLC)

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

In order to overcome the problem of making choice configuration parameters of RAID, we bring out mS/spl ***/RAID. A key problem for it is how to choose the optimal stripe unit size. However, till now this issue is not solved, especially under synchronous workload, because of the complexity about read-write of RAID and closed fork-join queue network. In this paper, we first present a read-write model of disk array under little and large I/O requests based on closed fork-join queue network model and analyze read-write action in RAID, and then deduce a approximately analytical expression to predict disk array's the mean response time under variety workload parameters designed to emulate real world condition. According to the analytical expression, we can get optimal stripe unit size under minimum mean response time. Finally, a large number of simulations have been carried out to validate our analytical result.

关键词： Predictive models Delay Queueing analysis Analytical models Laboratories data storage systems Computer science Bandwidth Parallel processing data communication

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A New Method of Pefetching I/O Requests

A New Method of Pefetching I/O Requests

引用

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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