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Extending attributes page:a scheme for enhancing the reliability of storage system metadata

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第8期10卷 1106-1113页

作者： Juan WANG Dan FENG Fang WANG Cheng-tao LU MOE Key Lab of Data Storage System Huazhong University of Science and Technology Wuhan 430074 China

In an object-based storage system,a novel scheme named EAP(extending attributes page) is presented to enhance the metadata reliability of the system by adding the user object file information attributes page for each user object and storing the file-related attributes of each user object in object-based storage *** EAP scheme requires no additional hardware equipments compared to a general method which uses backup metadata servers to improve the metadata *** a Markov chain,this paper compares the metadata reliability of the system using the EAP scheme with that using only metadata servers to offer the file metadata *** results demonstrate that the EAP scheme can dramatically enhance the reliability of storage system metadata.

关键词： Metadata server Metadata reliability Markov model Extending attributes page （EAP）

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Dynamics process of long-running allocation/collection in linear storage space

Dynamics process of long-running allocation/collection in li...

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2nd International Conference on Networking, Architecture, and storage, NAS 2007

作者： Qiang, Cao Guo, Tian-Jie Xie, Chang-Sheng Key Lab. of Data Storage System Computer School of Sci. and Tech. Huazhong University of Science and Technology

ISBN: (纸本)0769529275

storage system could provide storage space and relevant access operations including allocating storage resources to new object and reclaiming storage space occupied by released objects. Allocation and collection operations are frequent, basic and specially impact on data distribution in storage space. Contrarily, data distribution also heavily effect on performance of access operations including of allocation and collection. However, it is absent to study how above two basic operates effect on data distribution in long time running. In this paper, dynamics process of continuously allocating and collecting in linear storage space are analyzed and described. We firstly build an abstract theory model of storage system. Furthermore, the dynamics of allocating/collecting is discussed. We obtain relevant descriptive equation and prove the discrete degree of system to converge around a fixed value in both continuous and inconsecutive allocation cases. In the end, our simulation experiment also could validate academic analysis. © 2007 IEEE.

关键词： Dynamics

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Studying of multi-dimensional based replica management in object storage system

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IFIP International Conference Embedded and Ubiquitous Computing

作者： Tan, Zhipeng Feng, Dan He, Fei Zhou, Ke Huazhong Univ Sci & Technol Minist Educ Sch Comp Dept Comp SciKey Lab Data Storage System Wuhan 430074 Peoples R China

ISBN: (纸本)9783540770893

The Object-based storage system (OBS) has been proposed as a novel information storage technology in adaptation to the explosive growth in information quantity under the next-generation internet. The OBS treats all storage devices (OSD) and data information as objects, hence, the issues like reducing access delay over WAN, saving limited bandwidth and enhancement of data validity become problems related to the overall performance of OBS. To address these problems, we have the replica-based OBS, which brings forward a new issue on how to manage these replicas. In this paper, we present a multi-dimensional replica management scheme, and study the object searching performance within this mode. We deliver the optimal tree & improved one-path tree on the basis of similarity searching, with detailed replica indexing algorithm and emulation tests. The result of these experiments justifies their better performance in contrast to normal similarity-based indexing algorithm, with lower system cost.

关键词： multi-dimensional architecture optimal tree one-path tree replica management searching

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Characteristics of Si-Sb-Te films for phase change memory

Characteristics of Si-Sb-Te films for phase change memory

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2006 MRS Spring Meeting

作者： Jie, Feng Yin, Zhang Baowei, Qiao Yanfei, Cai Yinyin, Lin Tingao, Tang Bingchu, Cai Bomy, Chen Key Lab. for Thin Film and Microfabrication Shanghai Jiao Tong University Ministry of Education 1954 Huasan Road Shanghai 200030 China State Key Laboratory of ASIC System Fudan University Shanghai 200433 China Silicon Storage Technology Inc. 1171 Sonora Court Sunnyvale CA 94086

The novel phase change materials Si-Sb-Te films were prepared. The crystallization temperature of films increases with the increasing of Si concentration. Phase separation was observed in the Si-Sb-Te films, the dominant phase is Sb2Te3. The melting temperature of Si-Sb-Te decreased to ∼550°C lower than 640°C of Ge2Sb 2Te5. The decrease of film thickness of Si-Sb-Te films is less than 2% after annealing at 400°C, which is less than ∼7% of the film thickness change of Ge2Sb2Te5 film. The crystalline resistivity of Si-Sb-Te films increased and the ratio of amorphous/crystalline resistivity of Si-Sb-Te films increased also comparing with Ge2Sb2Te5 film, which is benefit to reduce the writing current and keep higher on/off ratio of phase change memory. Reversible switching was performed in the devices with Si-Sb-Te films. The device with Si14.3Sb28.6Te57.2 film can be programmed with a 100 ns SET pulse and a 20 ns RESET pulse. The Reset current is only 1.37mA for a 10μm-sized device. © 2006 Materials Research Society.

关键词： Thin films

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Some solutions for writing current reduction and high density application of phase change memory

Some solutions for writing current reduction and high densit...

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ICSICT-2006: 2006 8th International Conference on Solid-State and Integrated Circuit Technology

作者： Lin, Yinyin Feng, Jie Cai, Yaifei Lv, Hangbing Liao, Feifei Liu, Xin Tang, Tingao Qiao, Baowei Lai, Yunfeng Zhang, Yi Cai, Bingchu Chen, Bomy Department of Microelectronics ASIC and System State Key Lab. Fudan University Shanghai 200433 China Research Institute of Micro/Nanometer Technology Shanghai Jiao Tong University Shanghai 200030 China Silicon Storage Technology Inc. 1171 Sonora Court Sunnyvale CA 94086 United States

High writing current is the bottle-neck of PCM application and efforts focus on merely materials doping to improve crystal resistivity, novel structure to decrease active area etc. Here some solutions of our group are... 详细信息

ISBN: (纸本)1424401615

关键词： Phase change memory

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Some Solutions for Writing Current Reduction and High Density Application of Phase Change Memory

Some Solutions for Writing Current Reduction and High Densit...

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2006 8th International Conference on Solid-State and Integrated Circuit Technology

作者： Yinyin Lin Jie Feng Yaifei Cai Hangbing Lv Feifei Liao Xin Liu Tingao Tang Baowei Qiao Yunfeng Lai Yi Zhang Bingchu Cai Bomy Chen Department of Microelectronics ASIC and System State Key Lab.Fudan University Research Institute of Micro/Nanometer Technology Shanghai Jiao Tong University Silicon Storage Technology Inc.1171 Sonora CourtSunnyvaleCA94086USA

＜正＞High writing current is the bottle-neck of PCM application and efforts focus on merely materials doping to improve crystal resistivity,novel structure to decrease active area *** some solutions of our group are ...

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Research and implementation of remote desktop protocol service over SSL VPN

Research and implementation of remote desktop protocol servi...

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Proceedings - 2004 IEEE International Conference on Services Computing, SCC 2004

作者： Cai, Longzheng Yu, Shengsheng Zhou, Jing-Li Key Lab. of Data Storage System Ministry of Education Wuhan 430074 China

ISBN: (纸本)0769522254

Remote Desktop Protocol (RDP) allows a client to communicate with a Windows server. With RDP, you can run applications on a server from a remote client. RDP uses authentication and encryption to prevent traffic from leak. But the methods used have vulnerabilities and may encounter attacks. In this paper, a security-enhanced approach is proposed and implemented.

关键词： Network protocols

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SOSS: Smart object-based storage system

SOSS: Smart object-based storage system

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Proceedings of 2004 International Conference on Machine Learning and Cybernetics

作者： Zeng, Ling-Fang Feng, Dan Qin, Ling-Jun Key Lab. of Data Storage System Huazhong Univ. of Sci. and Technol. Ministry of Education 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. But 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 method 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： storage allocation (computer)

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A scalab.e object-based intelligent storage device

A scalable object-based intelligent storage device

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Proceedings of 2004 International Conference on Machine Learning and Cybernetics

作者： Feng, Dan Qin, Ling-Jun Zeng, Ling-Fang Liu, Qun Key Lab. of Data Storage System Ministry of Education Huazhong Univ. of Sci. and Technol. Wuhan China

ISBN: (纸本)0780384032

A Scalab.e Object-based Intelligent storage Device (SOID) is presented in the paper. A scalab.e way in SOID to describe object attributes is discussed and it makes the system adaptive to more application fields. In SOID system, users can register and upload methods at 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 input stream in a SOID, SOID has explored two promising enhancements: object-based interface and embedded computational capabilities, and it improves the scalab.lity of storage system.

关键词： data storage equipment

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Cache prefetching adaptive policy based on access pattern

Cache prefetching adaptive policy based on access pattern

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Proceedings of 2002 International Conference on Machine Learning and Cybernetics

作者： Zhou, Ke Zhang, Jiang-Ling Feng, Dan Wan, Zhi-Kun Huazhong Univ. of Sci. and Technol. Data Storage State Key Lab. Ministry of Education Wuhan China

ISBN: (纸本)0780375084

Different policy of cache and prefetching fits different access pattern. This paper introduces research status of cache and prefetching technologies of storage system. By analyzing access pattern, this paper provides a module of access pattern and tests cache and prefetching adaptive policy on RAID (redundant array of independent disk). Test proves that adaptive policy can get optimal performance of RAID under different conditions.

关键词： Pattern recognition

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