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

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Adaptive policy trigger mechanism for OBSS

Adaptive policy trigger mechanism for OBSS

引用

International Conference on Advanced Information Networking and Applications (AINA)

作者： Dan Feng Lingfang Zeng Fang Wang Lingjun Qin Qun Liu Key Laboratory of Data Storage System Ministry of Education School of Computer Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)0769522491

Traditional storage systems, such as NAS, SAN, are largely unaware of the users and applications actually using the storage, because block-based storage devices manage opaque data blocks. But, with OBSS (object-based storage system), the attributes and methods among the storage devices can be adopted in the storage system, the data can be distributed on some of the storage devices and organized better to anticipate users demand. In this paper, the scalability of object storage (including object attributes, object methods and OBSS) is studied. And a self-managing approach, denoted adaptive policy trigger mechanism (APTM), is presented. APTM borrows proven machine learning techniques and takes the perspective scalable object storage. The implementation reveals that APTM is the embodiment of the idea about smart storage device and facilitates to self-manage mass storage system.

关键词： storage area networks Scalability Application software Intelligent systems databases Hardware Laboratories data storage systems Computer science education Educational technology

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A New Technique for Eliminating data Migration in Logistic Evolution storage system

A New Technique for Eliminating Data Migration in Logistic E...

引用

International Conference on Computer and Information Technology (CIT)

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

ISBN: (纸本)076952432X

In order to change the status that distributed storage system can't adapt to dynamic workloads, we introduce a new concept of evolution redundancy in logistic evolution storage system. It associates the redundancy level that characterizes the storage organization to sets of data and not to storage areas while eliminating data migration for reconfiguration. Inside storage node, the storage space is divided into some sequential region that can automatically adjust data layout on the basis of workload without data migration. Then evolution redundancy makes the map between logic block address and physical block address become very simply so as to avoid bottleneck incurred by complex map. For saving storage space during transforming between various RAID levels, we propose independent disks group by which our system not only implement evolution redundancy but also achieve well performance/cost. Finally, we carry out a large number of simulations to validate transformation threshold between different RAID levels

关键词： Logistics storage automation Computer aided instruction Laboratories data storage systems Computer science Reconfigurable logic Costs Bandwidth Scalability

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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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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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Object replication and migration policy based on OSS

Object replication and migration policy based on OSS

引用

International Conference on Machine Learning and Cybernetics (ICMLC)

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

It obviously gets limited advantage in massive storage system that all the management works are done by the servers, such as file server and metadata server of traditional storage area network (SAN). Moreover, storage device with deficient intelligence leads to lack of supporting local policy and does not scale well in performance and functionality when the number of storage device is added. At the same time, servers, e.g. metadata servers, are easy turned into bottlenecks when load balancing policies only depend on servers to scheme. This paper studied object storage system (OSS) which is a novel solution for massive storage. And the whole object storage system is divided into some domains. Each domain has its own metadata server, object storage controllers and clients (or application servers). Load balancing policies, involved three facets: metadata server (based on globe), object storage controller (based on local) and object, are presented.

关键词： File servers Network servers Load management Peer to peer computing Computer networks Scalability storage area networks Intelligent networks Proposals Laboratories

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A Strategy of Load Balancing in Object storage system

A Strategy of Load Balancing in Object Storage System

引用

International Conference on Computer and Information Technology (CIT)

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

ISBN: (纸本)076952432X

Most of traditional load balancing strategies are based on servers or applications architecture. storage subsystem, as the back tier, provides file or block interface to server or application tier, is often ignored when the bottleneck of service is studied. Our load balancing strategy is based on storage object, which provides object interface for the up tier. We concentrate on storage objects with massive dynamic processing. The characteristics of storage object in object storage system (OSS) enable us to apply our load balancing strategy at the back end of servers or applications in order to deal with bottlenecks at the storage tier in data-intensive applications

关键词： Load management Application software File servers Network servers Back Biology computing Distributed computing Biological system modeling Predictive models data storage systems

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An intelligent prefetching strategy for a data grid prototype system

An intelligent prefetching strategy for a data grid prototyp...

引用

International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Jianxi Chen Dan Feng Key Laboratory of Data Storage System Ministry of Education College of Computer Science & Technology Huazhong University of Science and Technology Wuhan China

An amount of data-intensive applications pay more attention to the performance of storage system. Prefetching is an efficient approach to improve the I/O performance. The present algorithms of prefetching have some limitations and cannot suit for some kinds of access patterns. Intelligent prefetching strategy can recognize the current access pattern by analyzing the access trace independently. Prefetching based on the pattern recognized is more effective than blindly prefetching. Using this algorithm in a VI-based data grid prototype system (VI-DGPS), the storage nodes is divided into groups by the relation of the data, only one node judges the pattern and all other nodes just receive the pattern info in a group. All nodes in a group prefetch synchronously based on the access pattern to reduce the request response time. Test result shows that the strategy has a good performance in our system.

关键词： Prefetching Prototypes Educational technology Pattern recognition Delay system testing Laboratories data storage systems Computer science education Computer science

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The NDMP-plus prototype design and implementation for network based data management

引用

IFIP International Conference on Network and Parallel Computing, NPC 2004

作者： Ouyang, Kai Zhou, Jingli Xia, Tao Yu, Shengsheng Key Laboratory of Data Storage System Ministry of Education Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)3540233881

Network based data management/backup/restore is the key component in the data storage centre. This paper proposes a new network based data management --- NDMP-Plus. We firstly discuss the components of the NDMP-Plus architecture. Then, we detail two new techniques in NDMP-Plus --- VSL (Virtual storage Layer) and the negotiation mechanism. VSL is the core component to implement the flexibility, which could avoid the network communication with the storage media directly. And the negotiation mechanism is the key mechanism to improve the performance. Furthermore, we carry out an experiment to evaluate the performance of NDMP-Plus. The result of it suggests that NDMP-Plus has stronger flexibility and higher performance than the original NDMP. © IFIP International Federation for Information Processing 2004.

关键词： Information management

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A scalable object-based intelligent storage device

A scalable object-based intelligent storage device

引用

International Conference on Machine Learning and Cybernetics (ICMLC)

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

A scalable object-based intelligent storage device (SOID) is presented in this paper. A scalable way of describing the object attributes of SOID is discussed and is adaptive to many application fields. In the SOID system, the users can register and upload methods at the device and associate an object with a chain of methods. Any kind of operations on objects can be performed by the method chains which are executed by taking the object as an input stream in a SOID. The SOID has also explored two promising enhancements: object-based interface and embedded computational capabilities. It improves the scalability of storage system.

关键词： Computational intelligence Computer architecture Streaming media Computer interfaces Embedded computing Intelligent networks Laboratories data storage systems Computer science education Educational technology

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