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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 Key Laboratory of Data Storage System Huazhong University of Science슠and슠Technology Wuhan China

Disk mirroring or RAID1 is a popular paradigm to achieve fault tolerance and high reliability, this paper describes four mirrored disk organizations: basic mirroring, group rotate declustering, interleaved declustering, chained declustering, then the membership function of the states is defined and the reliability of mirrored disk system is analyzed by using the reliability theory based on fuzzy state.

关键词： Reliability theory Fuzzy systems Fuzzy set theory Reliability engineering Risk analysis Information technology Information analysis Educational institutions Computer science Laboratories

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Cache Coherency Design in Pentium Ⅲ SMP system

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Wuhan University Journal of Natural Sciences 2006年第2期11卷 360-364页

作者： LIU Jinsong ZHANG Jiangling GU Xiwu Key Laboratory of Data Storage System Huazhong University of Science and Technology Wuhan 430074 Hubei China

This paper analyzes cache coherency mechanism from the view of system. It firstly discusses caehe-memory hierarchy of Pentium Ⅲ SMP system, including memory area distribution, cache attributes control and bus transaction. Secondly it analyzes hardware snoopy mechanism of P6 bus and MESI state transitions adopted by Pentium Ⅲ. Based on these, it focuses on how muhiprocessors and the P6 bus cooperate to ensure cache coherency of the whole system, and gives the key of cache coherency design.

关键词： snoop cache coherency MESI protocol P6bus Pentium Ⅲ SMP system

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An improved direct digital frequency synthesis system design

An improved direct digital frequency synthesis system design

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International Workshop on Networking, Architecture and storages

作者： Wang, Qingdong Xie, Changsheng Wang, Haiwei Liu, Chun Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology China

ISBN: (纸本)0769526519

This paper researches a programmable signal device by an improved direct digital frequency synthesis technology on DSP and FPGA to simulate servo signal for read-write channel of micro hard disk. This device has wide frequency range from 1Hz to 10MHz, high frequency resolution of 0.001Hz, high precision of frequency, phase and amplitude of output wave, good reliability, little distortion. Compared with general devices, this device can generate all kinds of servo signal, and circuit is simply, reliable, and programmable.

关键词： Frequency synthesizers

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Queue network modeling approach to analysis of the optimal stripe unit size for disk arrays under synchronous I/O workloads

Queue network modeling approach to analysis of the optimal s...

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2006 International Workshop on Networking, Architecture, and storages, NAS'06

作者： Ming, Wu Dong, Xiao-Ming Li, Huai-Yang Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology

ISBN: (纸本)0769526519

storage systems represent a growing market. In recent years there has been an explosion of applications that use enormous amounts of data. Disk arrays are today's standard solution for enterprise class storage systems. One of the most crucial parameters in designing a disk array is the size of the striping unit. The paper presents and validates a performance model for RAID level 5. The model is created as a closed fork-join queue network (CFJQN) under synchronous I/O workloads. It can be used to compute the optimal strip unit size for disk arrays.

关键词： Queueing networks

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iVISA: A framework for flexible layout block-level storage system

iVISA: A framework for flexible layout block-level storage s...

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20th International Conference on Advanced Information Networking and Applications

作者： Jianxi, Chen Dan, Feng Zhan, Shi Key Laboratory of Data Storage System Huazhong University of Science and Technology Ministry of Education Wuhan 430074 China

ISBN: (纸本)0769524664

High performance, high bandwidth, and scalable network storage system is the requirement tendency of most data-intensive applications. Distributed RAID, as a storage architecture, is widely used in cluster and distributed computing environments. But the data placement is mechanical and penalty for maintaining consistency is suffered. In this paper we propose a novel block-level storage architecture called iVISA (iSCSI based Virtual Interface storage Architecture) which employs the concepts both distributed RAID and virtualization storage. All storage resources distribute in a high performance VI network and are managed by a metadata server. A number of iSCSI target nodes act as the entrances of iVISA system for accessing through iSCSI connections. The storage resources are dynamically allocated to users during I/O accessing. The users' logical block addresses are intelligently and flexibly mapped to the physical block addresses based on the current workload of storage nodes and data layout. The evaluation result shows that better performance can be achieved by allocation and mapping dynamically and flexibly with optimized allocation strategy. A hybrid strategy considering both data layout and load of storage nodes has a 30% higher I/O performance than conventional distributed RAID. © 2006 IEEE.

关键词： Distributed computer systems

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A two-way selective encryption algorithm for MPEG video

A two-way selective encryption algorithm for MPEG video

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International Workshop on Networking, Architecture and storages

作者： Liu Jun Zou LingLing Xie Changsheng Huang Hao Key Laboratory of Data Storage System Huazhong University of Science and Technology China School of Computer Science Wuhan Institute of Technology China

ISBN: (纸本)0769526519

The security of multimedia data in digital network is commonly provided by encryption. Nevertheless, most current modern encryption algorithms, which only transform a plaintext message that is the simplest form of multimedia data into unintelligible ciphertext, are not appropriate for higher forms such as images and video with very large file sizes. Selective encryption of MPEG video streams has been proposed to reduce encryption requirements, saving in complexity and facilitating new system functionality. In this paper, a two-way selective encryption algorithm (TWAEA) for MPEG video is proposed to compromise the security and speed in the process of encryption.

关键词： Cryptography

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Flexible metadata management for block-level storage system

Flexible metadata management for block-level storage system

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7th ACIS International Conference on Software Engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing, SNPD 2006, including Second ACIS International Workshop on Self-Assembling Wireless Networks, SAWN 2006

作者： Jie, Xiao Dan, Feng Zhan, Shi Mengfei, Cheng Key Laboratory of Data Storage System Huazhong University of Science and Technology Ministry of Education Wuhan 430074 Hubei China

ISBN: (纸本)076952611X

The ever growing storage demands of modern applications cultivate a promising area of storage system management, centered upon metadata servers. Some of the works are done at the file system level, which care little about device level data organization. In this paper we present the design of managing metadata at block-level by using storage virtualization techniques. We propose both static and dynamic block mapping policies to meet the diverse needs of applications, balance disk workload and improve storage system performance. We build our prototype in a Virtual Interface based storage area network, and the evaluation results demonstrate that metadata management at block-level can be efficient and flexible. © 2006 IEEE.

关键词： Metadata

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An analytical model for scheduling policies in storage networks

An analytical model for scheduling policies in storage netwo...

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2006 International Workshop on Networking, Architecture, and storages, NAS'06

作者： Diqing, Hu Qiang, Cao Changsheng, Xie Key Laboratory of Data Storage System Chinese Ministry of Education University of Science and Technology Wuhan Hubei 430074 China

ISBN: (纸本)0769526519

The I/O routine in network storage has longer transferring time and overhead than local I/O. To well make use of the storage network bandwidth and meet demand of concurrent I/O requests, we need to find the appropriate schedule policy for I/O requests at the level of the network. The focus in the paper is on how to schedule concurrent I/O data transferring in share storage network, and to improve performance such as the response time affected by scheduling method. Our objective is to analysis the response time of concurrent requests as function their schedule order such as the sequenced, parallel and hybrid policies. We then verify our results by both the analytical method and experiment.

关键词： data storage equipment

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Dynamic replication strategies for object storage systems

Dynamic replication strategies for object storage systems

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EUC 2006: Embedded and Ubiquitous Computing Workshops

作者： Tan, Zhipeng Feng, Dan Key Laboratory of Data Storage System Huazhong University of Science and Technology Ministry of Education Wuhan 430074 Hubei China Department of Computer Science Huazhong University of Science and Technology China Huazhong University of Science and Technology China

ISBN: (纸本)3540368507

Object replication is an important and sophisticated question, it can reduce access latency and bandwidth consumption, replication can also help in load balancing and can improve reliability by creating multiple replicas of the same storage object. But there are many difficulties to realize object replication in efficiently. In this paper, we discuss the architecture of object storage system with object replication, and analyze key question of dynamic replication such as replica granularity N When to replicate storage object and Where to place the replicas etc. In the theory, we give the formulas of these question, the analysis prove these formulas are reasonable. © IFIP International Federation for Information Processing 2006.

关键词： data storage equipment

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Queue Network Modeling Approach to Analysis of the Optimal Stripe Unit Size for Disk Arrays under Synchronous I/O Workloads

Queue Network Modeling Approach to Analysis of the Optimal S...

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International Workshop on Networking, Architecture, and storages (IWNAS)

作者： Wu Ming Dong Xiao-ming Li Huai-yang Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology China

关键词： Queueing analysis Concurrent computing Aggregates Laboratories data storage systems Computer science Explosions Application software Computational modeling Online services

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