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

共 131 条记录，以下是81-90 订阅

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A two-way selective encryption algorithm for MPEG video

A two-way selective encryption algorithm for MPEG video

引用

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

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

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 Streaming media Video compression Image coding data security Video on demand Information security Multimedia systems High definition video HDTV

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An intelligent prefetching strategy for a data grid prototype system

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

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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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A Read Latency Variation Aware Independent Read Scheme for QLC SSDs

A Read Latency Variation Aware Independent Read Scheme for Q...

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Design, Automation and Test in Europe Conference and Exhibition

作者： Dong Huang Dan Feng Qiankun Liu Bo Ding Wei Zhao Xueliang Wei Wei Tong Key Laboratory of Information Storage System Engineering Research Center for Data System and Technology Ministry of Education Wuhan National Laborotory of Optoelectronics Huazhong University of Science and Technology

ISBN: (数字)9783981926385

ISBN: (纸本)9798350348606

QLC flash-based SSDs has attracted growing interest and is expected to fit in read-intensive scenarios owing to its higher cost-effectiveness and shorter write endurance compared with the Triple-Level Cell (TLC) SSDs. Recently, new commands supporting independent reads such as Single Operation Multiple Locations (SOML) and Independent multi-plane (IMP) read are proposed to improve read performance. Unfortuantely, while independent read exhibits a significant performance improvement, we show in this paper that the exisiting approach fails to fully exploit its potential due to the larger read latency variation and more planes per die for current SSD architecture. Through a set of experiments, we demonstrate that the lack of a read latency variation aware machanism leads to low performance of independent read among a wide variety of workloads. To alleviate this issue, we propose LITA, which key idea is to combine read transactions with similar latency into one command. LITA includes (1) LIT, a latency variation aware transaction combination, (2) and TASAP, a latency variation aware transaction completion service. The experimental results show LITA can reduce read latency by 20.4% and 9.6% on average for 4-planes QLC SSDs under IMP and SOML, respectively.

关键词： Microprocessors Computer architecture

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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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I/O Response Rate Analysis in the Replicate-Based Object storage system

I/O Response Rate Analysis in the Replicate-Based Object Sto...

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International Symposium on Distributed Computing and Applications to Business, Engineering and Science (DCABES)

作者： Zhipeng Tan Yulai Xie Quanli Gui Tian Zhan Wenhua Zhang Key Laboratory of Data Storage System Ministry of Education Wuhan National Laboratory of Optoelectronics School of Computer Science Huazhong University of Science and Technology Wuhan China

With the development of storage technology, storage system capacity has been rapidly growing, so rapid that storage I/O performance has become one of the most critical issues in large complex systems. This article combines the latest research in object-based storage with replica technology to share I/O in the object storage system, and to maintain high and stable I/O response rate. Theoretical derivation and simulation experiment results are both examined, which show the prominent role that replicas can play in improving system performance and maintain stable I/O response rate.

关键词： Time factors Throughput Bibliographies Laboratories Stability analysis Mathematical model File systems

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Mathematical properties of four wavelet filters and their performance in embedded image coders

Mathematical properties of four wavelet filters and their pe...

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International Conference on Signal Processing Proceedings (ICSP)

作者： Guo Hongxing Su Lei Yu Shengsheng Zhou Jingli Department of Computer Science and Engineering Key Laboratory of Data Storage System of Ministry of Education Huazhong University of Science and Technology Wuhan Hubei China

This paper analyses the mathematical properties of four famous wavelets and evaluates their coding performance for different kinds of images in EZW image coders. It can be found that although the 9/7 biorthogonal wavelets, which obtain better tradeoff among incompatible mathematical properties, give the best performance. But it still can't code edges and textures efficiently due to existing ringing and smearing artifacts at low bit rates. The harmonic decomposition must follow the uncertainty principle that prevents any atom perfectly, which is well localized in the space domain to retain frequency localization. It gives an opportunity to develop new paradigms to efficiently representing and coding structures very well localized in the space domain, but with large frequency band such as edges and textures.

关键词： Wavelet analysis Low pass filters Image coding Filter bank Image analysis Frequency Computer science data storage systems Computer science education Bit rate

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TSPSCDP: A Time-Stamp Continuous data Protection Approach Based on Pipeline Strategy

TSPSCDP: A Time-Stamp Continuous Data Protection Approach Ba...

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

作者： Jingning Liu Tianming Yang Zuoheng Li Ke Zhou School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Key Laboratory of Data Storage System Ministry of Education China

Traditional cold backup technology can not fight against data loss between two consecutive backups which usually has a time span of 24 hours. Hot backup technology, such as snapshot decreases the amount of potential data loss, but still cannot completely prevent data loss. More recently, a new technology called continuous data protection (CDP) is emerging to provide more powerful data protection. CDP captures every change to the data volume hence can provide any point-in-time data views and enable timely recovery to any point-in-time of user data. However, existing implementations of CDP usually suffer from poor write performance and cannot meet the data protection demand of some high performance application environments. How to improve the CDP performance in terms of write throughput and response time is one of the most important considerations in implementing CDP. This paper presents a time-stamp pipeline strategy continuous data protection approach called TSPSCDP which uses pipeline strategy in write operation of CDP to improve data processing capability. Our experiments demonstrated that TSPSCDP can not only recover data to any point-in-time upon a failure but also improve the CDP performance in terms of write throughput and respond time upon the ordinary CDP by a factor of 2 and about 25% respectively.

关键词： Protection Pipelines File systems Educational technology Throughput Availability Computer science Delay data storage systems Computer science education

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A Machine Learning Based Write Policy for SSD Cache in Cloud Block storage

A Machine Learning Based Write Policy for SSD Cache in Cloud...

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Design, Automation and Test in Europe Conference and Exhibition

作者： Yu Zhang Ke Zhou Ping Huang Hua Wang Jianying Hu Yangtao Wang Yongguang Ji Bin Cheng Wuhan National Laboratory for Optoelectronics Key Laboratory of Information Storage System Engineering Research Center of data storage systems and Technology Ministry of Education of China Tencent Technology (Shenzhen) Co. Ltd.

ISBN: (数字)9783981926347

ISBN: (纸本)9781728144689

Nowadays, SSD cache plays an important role in cloud storage systems. The associated write policy, which enforces an admission control policy regarding filling data into the cache, has a significant impact on the performance of the cache system and the amount of write traffic to SSD caches. Based on our analysis on a typical cloud block storage system, approximately 47.09% writes are write-only, i.e., writes to the blocks which have not been read during a certain time window. Naively writing the write-only data to the SSD cache unnecessarily introduces a large number of harmful writes to the SSD cache without any contribution to cache performance. On the other hand, it is a challenging task to identify and filter out those write-only data in a real-time manner, especially in a cloud environment running changing and diverse *** this paper, to alleviate the above cache problem, we propose an ML-WP, Machine Learning Based Write Policy, which reduces write traffic to SSDs by avoiding writing write-only data. The main challenge in this approach is to identify write-only data in a real-time manner. To realize ML-WP and achieve accurate write-only data identification, we use machine learning methods to classify data into two groups (i.e., write-only and normal data). Based on this classification, the write-only data is directly written to backend storage without being cached. Experimental results show that, compared with the industry widely deployed write-back policy, ML-WP decreases write traffic to SSD cache by 41.52%, while improving the hit ratio by 2.61% and reducing the average read latency by 37.52%.

关键词： Cloud computing Machine learning algorithms Prediction algorithms Servers Random access memory Random forests

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ARRAY: A Non-application-Related, Secure, Wide-Area Disaster Recovery storage system

ARRAY: A Non-application-Related, Secure, Wide-Area Disaster...

引用

International Symposium on Parallel and Distributed Processing with Applications, ISPA

作者： Lingfang Zeng Dan Feng Bharadwaj Veeravalli Qingsong Wei Division of Data Storage System Wuhan National Laboratory for Optoelectronics Key Laboratory of Information Storage Ministry of Education School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Department of Electrical and Computer Engineering National University of Singapore Singapore Data Storage Institute Singapore

With our society more information-driven, we have begun to distribute data in wide-area storage systems. At the same time, both physical failure and logic error have made it difficult to bring the necessary recovery to bear on remote data disaster, and understanding this proceeding. We describe ARRAY, a system architecture for data disaster recovery that combines reliability, storage space, and security to improve performance for data recovery applications. The paper presents an exhaustive analysis of the design space of ARRAY systems, focusing on the trade-offs between reliability, storage space, security, and performance that ARRAY must make. We present RSRAII (Replication-based Snapshot Redundant Array of Independent Imagefiles) which is a configurable RAID-like data erasure-coding, and also others benefits come from consolidation both erasure-coding and replication strategies. A novel algorithm is proposed to improve snapshot performance referred to as SMPDP (Snapshot based on Multi-Parallel Degree Pipeline).

关键词： Secure storage Network servers Bandwidth Redundancy data security Cities and towns Laboratories Educational technology Hardware History

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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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