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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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ARS: Reducing F2FS Fragmentation for Smartphones using Decision Trees

ARS: Reducing F2FS Fragmentation for Smartphones using Decis...

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Design, Automation and Test in Europe Conference and Exhibition

作者： Lihua Yang Fang Wang Zhipeng Tan Dan Feng Jiaxing Qian Shiyun Tu Wuhan National Laboratory for Optoelectronics Key Laboratory of Information Storage System Engineering Research Center of Data Storage Systems and Technology Huazhong University of Science & Technology

ISBN: (数字)9783981926347

ISBN: (纸本)9781728144689

As we all know, file and free space fragmentation negatively affect file system performance. F2FS is a file system designed for flash memory. However, it suffers from severe fragmentation due to its out-of-place updates and the highly synchronous, multi-threaded writing behaviors of mobile applications. We observe that the running time of fragmented files is 2.36× longer than that of continuous files and that F2FS's in-place update scheme is incapable of reducing fragmentation. A fragmented file system leads to a poor user experience.(p)(/p)Reserving space to prevent fragmentation is an intuitive approach. However, reserving space for all files wastes space since there are a large number of files. To deal with this dilemma, we propose an adaptive reserved space (ARS) scheme to choose some specific files to update in the reserved space. How to effectively select reserved files is critical to performance. We collect file characteristics associated with fragmentation to construct data sets and use decision trees to accurately pick reserved files. Besides, adjustable reserved space and dynamic reservation strategy are adopted. We implement ARS on a Hikey960 development platform and a commercial smartphone with slight space and file creation time overheads. Experimental results show that ARS reduces file and free space fragmentation dramatically, improves file I/O performance and reduces garbage collection overhead compared to traditional F2FS and F2FS with in-place updates. Furthermore, ARS delivers up to 1.26× transactions per second under SQLite than traditional F2FS and reduces running time of realistic workloads by up to 41.72% than F2FS with in-place updates.

关键词： Smart phones Performance evaluation Facebook Twitter Decision trees Writing databases

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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

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

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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 (IWNAS)

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

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 1 Hz to 10MHz, high frequency resolution of 0.001 Hz, 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 Signal synthesis Servomechanisms Digital signal processing Field programmable gate arrays Hard disks Signal resolution Phase distortion Signal generators Circuits

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Creation of a Java-based interactive modeling environment with tape library model example

Creation of a Java-based interactive modeling environment wi...

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

作者： LingFang Zeng Dan Feng Fang Wang Zhuo Cheng Qiang Zou Key Laboratory of Data Storage System Ministry of Education School of Computer Huazhong University of Science and Technology China

Within high performance backup/restore environment there are cases that require the retrieval of massive data with huge size from tape storage to disks. The data retrieval time affects the system utilization or the system recovering speed. Some schemes were/will be proposed to place data across tape drives for minimized data retrieval latency. SimTape, a Java-based tape library simulator, is built to compare above mentioned allocation schemes which minimize data seek time and tape switch time respectively. This paper describes the development and application of SimTape's software simulation model, also, for the design and optimization of the record, readout and data recovery processes common to all existing tape library processes. The simulation model provides an accurate statistical report from which each scenario can be evaluated

关键词： Java Software libraries Robots Information retrieval Scheduling algorithm Delay Switches Throughput Analytical models Graphical user interfaces

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An High Integrated Direct Digital Frequency Synthesis system Design

An High Integrated Direct Digital Frequency Synthesis System...

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International Conference on Communications and Networking in China (CHINACOM)

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

This paper researches a programmable signal generator by an high integrated direct digital frequency synthesis (DDFS) technology on FPGA to simulate servo signal for read-write channel of micro hard disk. This device use very large-scale integrated circuit FPGA (field-programmable logic) to integrate PDSP (programmable digital signal processor) for look-up table and integrate DDFS design, use 16 bit high resolution DAC (digital to analog converter) .This device has 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 Integrated circuit synthesis Signal synthesis Signal generators Field programmable gate arrays Servomechanisms Integrated circuit reliability Integrated circuit technology Circuit simulation Hard disks

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NDMP-Plus： An Improved Protocol for Network Based data Management

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Journal of Shanghai University(English Edition) 2005年第6期9卷 510-516页

作者：欧阳凯周敬礼郭辉余胜生 Key Laboratory of Data Storage System of Ministry of Education Huazhong University of Science and Technology Wuhan 430074P. R . China

Network based data management is the backup/restore mechanism used in a data storage center. This paper presents a new network based data management-NDMP-Plus, a revision of network data management protocol. Components and the working mechanism of the NDMP-Plus architecture are first discussed. Two new techniques in NDMP-Plus-virtual storage layer （VSL） and negotiation mechanism are then studied. VSL is a crucial component to achieve flexibility, and the negotiation mechanism is a key to improve performance. Furthermore, experiments are carried out to evaluate the performance of NDMP-Plus. The result suggests that NDMP-Plus has stronger flexibility and better performance than NDMP.

关键词： NDMP virtual storage layer negotiation mechanism

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Adaptive policy trigger mechanism for OBSS

Adaptive policy trigger mechanism for OBSS

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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...

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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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A scalable object-based intelligent storage device

A scalable object-based intelligent storage device

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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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