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Intermag 2006 (INTERMAG 2006), vol.2

作者： Y. Deng F. Wang K. Zhou S. Wu Center for Grid Computing Cambridge-Cranfield High Performance Computing Facility Cranfield Bedfordshire UK Key Laboratory of Data Storage System Ministry of Education School of Computer Huazhong University of Science and Technology Wuhan China

With a SAN (storage Area Network), large-capacity storage can be shared among multiple hosts at high speed. The potential market for SAN is enormous, but the technology won't become ubiquitous overnight. The complex administration is indicated by many researches as a key barrier to adopt SAN solutions. This paper designs and implements a virtual storage image (VSI) that aggregates storage space located on heterogeneous storage nodes (see Fig.1)in a Fibre Channel point-to-point (FC-P2P) SAN.

关键词： Image storage storage area networks Fault tolerant systems Bandwidth File systems Space technology Aggregates Linux Fault tolerance Load management

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VCL: A high performance virtual CD library server

VCL: A high performance virtual CD library server

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Seventh International Symposium on Optical storage, ISOS 2005

作者： Wan, Jiguang Xie, Changsheng Tan, Zhihu Key Laboratory of Data Storage System Huazhong University of Science and Technology Wuhan 430074 China

With the increasing of CD data in internet, CD mirror server has become the new technology. Considering the performance requirement of the traditional CD mirror server, we present a novel high performance VCL (Virtual CD Library) server. What makes VCL server superior is the two patented technologies: a new caching architecture and an efficient network protocol specifically tailored to VCL applications. VCL server is built based on an innovative caching technology. It employs a two-level cache structure on both a client side and the server side. Instead of using existing network and file protocols such as SMB/CIFS etc that are generally used by existing CD server, we have developed a set of new protocols specifically suitable to VCL environment. The new protocol is a native VCL protocol built directly on TCP/IP protocol. VCL protocol optimizes data transfer performance for block level data as opposed to file system level data. The advantage of using block level native protocol is reduced network-bandwidth requirement to transfer same amount of data as compared to file system level protocol. Our experiment and independent testing have shown that VCL servers allow much more number of concurrent users than existing products. For very high resolution DVD videos, VCL with 100Mbps NIC supports over 10 concurrent users viewing the same or different videos simultaneously. For VCD videos, the same VCL can support over 65 concurrent users viewing videos simultaneously. For data CDs, the VCL can support over 500 concurrent data stream users.

关键词： Compact disks

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The approximate parameters analysis of mS RAID

The approximate parameters analysis of mS RAID

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International Conference on Machine Learning and Cybernetics, ICMLC 2005

作者： Li, Huai-Yang Xie, Chang-Sheng Liu, Yan Zhao, Zhen Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)078039092X

In order to overcome the problem of making choice configuration parameters of RAID, we bring out mS_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. © 2005 IEEE.

关键词： Queueing networks

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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...

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International Conference on Machine Learning and Cybernetics, ICMLC 2005

作者： Liu, Yan Xie, Chang-Sheng Li, Huai-Yang Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)078039092X

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. © 2005 IEEE.

关键词： data transfer

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A RAID controller: Software, hardware and embedded platform based on Intel IOP321

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First International Conference on Embedded Software and systems, ICESS 2004

作者： Dong, Xiao-Ming Wan, Ji-Guang Liu, Rui-Fang Tan, Zhi-Hu Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 China

ISBN: (纸本)3540281282

While demand for large-scale storage services is growing very rapidly, RAID is still today's standard solution for enterprise class storage systems. The software and hardware designing of a RAID controller based on Intel IQ80321 platform is introduced, in which embedded Linux is setup on the board, and a prototype system is implemented on x86 platform with Fibre Channel interface to host. The benchmark test presents throughput of 186MB/s and 184MB/S for RAID 5 reading and writing respectively. © Springer-Verlag Berlin Heidelberg 2005.

关键词： data storage equipment

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Security policy analysis in network-attached optical disk storage system

Security policy analysis in network-attached optical disk st...

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Seventh International Symposium on Optical storage, ISOS 2005

作者： Liu, Jun Xie, Changsheng Huang, Hao Key Laboratory of Data Storage System Huazhong University of Science and Technology Wuhan 430074 China Department of Computer Science Wuhan Institute of Technology Wuhan 430074 China

The network-attached optical disk storage system has the advantages of the network-attached storage system and the optical storage device. Due to the data reliability and the removability of the storage medium, this optical storage system is very effective on massive data providing and backup. Recently, achievements have been made in security models and policies in a distributed network system environment and the network-attached storage system environment. However, the relevant research is not enough in the network-attached optical disk storage system, especially in a network-attached optical disc device. So it is significant to analyze the security policy and setup a good security model for the network-attached optical disk storage system. This paper makes a theoretical analysis on the security policy in the network-attached optical disk storage system. Firstly, the difference of the network-attached optical disk storage system and the distributed network system environment is presented. The network-attached optical disk storage system is a special distributed network system, and to meet the requirements of the system security, we use the authentication and key exchange protocol method to decide who is authorized to have what access rights on which objects with respect to some security models and policies in compute system. Secondly, we compare the effect of several types of authentication and key distribution protocols in a distributed network system environment. Then we port these authentication and key exchange protocols on the network-attached optical disk storage system environment. Based on these analyses, this paper proposes a secure key management scheme for security services in the network-attached optical disk storage system over open networks. This scheme focuses on the framework for authentication and the centralized key management, and future work will focus on dynamic membership management.

关键词： Optical disk storage

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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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Hybrid RAID-tape-library storage system for backup

Hybrid RAID-tape-library storage system for backup

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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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