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Constrained Coding for Magnetization Transition Noise of Ultra-High Density Magnetic storage

Tien Tzu Hsueh Pao/Acta Electronica Sinica 2025年第2期53卷 483-492页

作者： Luo, Ke Li, Wei Jian, Yu-Gen Gao, Hong-Yu Zhang, Ke-Zheng Liao, Yan-Zhe Wu, Yu-Fei Chen, Jin-Cai Lu, Ping Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Hubei Wuhan 430074 China School of Computer Science and Technology Huazhong University of Science and Technology Hubei Wuhan 430074 China Key Laboratory of Information Storage System Engineering Research Center of Data Storage Systems and Technology Ministry of Education of China Huazhong University of Science and Technology Hubei Wuhan 430074 China

As the recording density of magnetic storage increases, the recording bit spacing decreases and the magnetization transition noise increases significantly, which greatly affects the quality of the readback signal. To mitigate the interference of magnetization transition noise problem among recording patterns in ultra-high density magnetic storage systems, the maximum transition run (MTR) constraint code MTR(j= 1), which limits the continuous transition, is proposed to effectively suppress the magnetization transition noise compared with the constraint codes MTR(j= 2) and MTR(j= 3), which allow continuous transitions. We investigate the detection effect of the readback signal experimentally. When the signal-to-noise ratio is 12 dB, the detection bit error rate (BER) of MTR(j= 1) is reduced by about 30% and 60% relatively compared with MTR(j= 2) and MTR(j= 3), respectively. We confirmed that the MTR(j= 1) constrained coding that forbids continuous transitions can achieve higher data detection reliability. © 2025 Chinese Institute of Electronics. All rights reserved.

关键词： constrained coding equalization and detection high-density magnetic storage magnetization transition noise write and read process

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Application-oriented storage: Geographic information systems as an example

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Journal of Information and Computational Science 2007年第2期4卷 859-870页

作者： Zeng, Lingfang Feng, Dan Wang, Fang Tian, Lei Shi, Zhan Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

With the development of the hardware technology of computer architecture, how to utilize the computation power on the future storage device to provide high performance computation and data access has been a hot and challenging task. With more powerful CPU, future infinite capacity disk will be a supercomputer! And we should put applications close to storage objects. storage object has been proposed in the past, but its definition should be perfected. The goals of the application-based storage project are to combine and distill structured data and unstructured data into an unified model, design an understandable extension to storage object, and most importantly build a working geographic information systems (GIS) (as an application example) which integrates conventional database management and file system by an Unified storage Middleware (USM) of object-based storage system.

关键词： data storage equipment

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Virtual storage image implementation in a SAN system to improve storage capacity, fault tolerance and bandwidth

Virtual storage image implementation in a SAN system to impr...

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INTERMAG 2006 - IEEE International Magnetics Conference

作者： Deng, Y. Wang, F. Zhou, K. Wu, S. Center for Grid Computing Cambridge-Cranfteld High Performance Computing Facilities Cranfield University Campus Bedfordshire MK430AL United Kingdom Key Laboratory of Data Storage System Ministry of Education Huazhong University of Science and Technology Wuhan 430074 China

No abstract available

ISBN: (纸本)1424414792

No abstract available

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Object replication and migration policy based on OSS

Object replication and migration policy based on OSS

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Ling-Fang Zeng Dan Feng Fang Wang Ke Zhou Key Laboratory of Data Storage System Ministry of Education School of Computer Huazhong University of Science and Technology Wuhan Hubei China

It obviously gets limited advantage in massive storage system that all the management works are done by the servers, such as file server and metadata server of traditional storage area network (SAN). Moreover, storage device with deficient intelligence leads to lack of supporting local policy and does not scale well in performance and functionality when the number of storage device is added. At the same time, servers, e.g. metadata servers, are easy turned into bottlenecks when load balancing policies only depend on servers to scheme. This paper studied object storage system (OSS) which is a novel solution for massive storage. And the whole object storage system is divided into some domains. Each domain has its own metadata server, object storage controllers and clients (or application servers). Load balancing policies, involved three facets: metadata server (based on globe), object storage controller (based on local) and object, are presented.

关键词： File servers Network servers Load management Peer to peer computing Computer networks Scalability storage area networks Intelligent networks Proposals Laboratories

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High Availability storage system Based on Two-Level Metadata Management

High Availability Storage System Based on Two-Level Metadata...

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

作者： Fang Wang Yinliang Yue Dan Feng Juang Wang Peng Xia Key Laboratory of Data Storage System Ministry of Education School of Computer Huazhong University of Science and Technology Wuhan Hubei China

Generally storage devices only administrate the mapping of logical data space to local physical space while unknowing other information related to data objects. Network or metadata service failure will disable the system, although the data is still on devices intact and correct. Utilizing the redundant computing ability of storage devices, the object interface makes it possible to assist the MDS for metadata services to improve the availability of the system. Though extended attributes of the object interface and computing resource, the management of the object allocation, and local metadata service are enabled in active object storage devices (A-OSD). Based on A-OSDs, a distributed high availability storage system (HASS) characterized by two-level metadata management can be built to achieve higher availability while maintaining good performance. Experiments indicate under the same environment, compared with Lustre, HASS has better write performance and similar read performance besides the potential high availability.

关键词： Availability File systems Resource management Environmental management Network servers Computer interfaces Secure storage Computer network management Project management Technology management

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ESS: A NEW storage ARCHITECTURE FOR MID/LARGE RAID

ESS: A NEW STORAGE ARCHITECTURE FOR MID/LARGE RAID

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2006 International Conference on Machine Learning and Cybernetics(IEEE第五届机器学习与控制论坛)

作者： YAN LIU CHANG-SHENG XIE HUAI-YANG LI ZHEN ZHAO Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

Referring to the concept of "distributed virtual disks" in cluster file system, this paper proposes a new storage architecture for mid/large-scale RAID-ESS, which consists of several different-structure SubRAIDs. Clients data can migrate into optimal SubRAID dynamically according to their access characteristics; the number of SubRAIDs and the structure of each SubRAID can also be adjusted to the evolution of system load, thus the whole ESS system can always provide a virtual disk for each client to satisfy its I/O need. Simulation results demonstrate significant I/O performance advantage in ESS, compared with the traditional mid/large-scale RAID5 or RAID1 of the same storage space.

关键词： RAID Cluster file system Virtual disks data migration

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Scalability Support for SMI-S with Chord

Scalability Support for SMI-S with Chord

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IEEE International Conference on High Performance Computing and Communications (HPCC)

作者： Ze Deng Dan Feng Zhan Shi Chao Luo Key Laboratory of Data Storage System Ministry of Education School of Computer Huazhong University of Science and Technology Wuhan Hubei China

The storage management initiative specification (SMI-S) has been proposed for years to standardize the management of storage resources in storage area network (SAN). However, current management architecture mainly focuses on local area management. In this paper, we propose a scalable management architecture based on the integration of SMI-S and Chord. Meanwhile, Chord can only deal with exact query, the query of storage resources is significantly more complex. To deal with this problem, we further improve our architecture with a scalable blind search method - recursive partition search (RPS). Experiments show RPS is an effective approach for storage resource range query in the case that the Chord overlay network is not very large.

关键词： Computer architecture Computer integrated manufacturing XML databases Scalability storage area networks Partitioning algorithms

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A Strategy of Load Balancing in Object storage system

A Strategy of Load Balancing in Object Storage System

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International Conference on Computer and Information Technology (CIT)

作者： Lingfang Zeng Dan Feng Fang Wang Ke Zhou Key Laboratory of Data Storage System Ministry of Education School of Computer Huazhong University of Science and Technology Wuhan Hubei China

ISBN: (纸本)076952432X

Most of traditional load balancing strategies are based on servers or applications architecture. storage subsystem, as the back tier, provides file or block interface to server or application tier, is often ignored when the bottleneck of service is studied. Our load balancing strategy is based on storage object, which provides object interface for the up tier. We concentrate on storage objects with massive dynamic processing. The characteristics of storage object in object storage system (OSS) enable us to apply our load balancing strategy at the back end of servers or applications in order to deal with bottlenecks at the storage tier in data-intensive applications

关键词： Load management Application software File servers Network servers Back Biology computing Distributed computing Biological system modeling Predictive models data storage systems

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SDBIA: A Novel Approach to Improve the Reading Performance of Large Objects for Object-Based storage Device

SDBIA: A Novel Approach to Improve the Reading Performance o...

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

作者： Jingning Liu Wanli Peng Fang Wang Yinliang Yue School of Computer Science and Technology Key Laboratory of Data Storage System Ministry of Education Huazhong University of Science and Technology Wuhan China

Ext2 file system is optimized for the management of small files, however, the performance of managing large files is not perfect. The Object-based storage Device of HOSS[1] (Huge Object-Based storage system, HOSS) adopts ext2 as the underlying file system, so the performance of managing large objects is limited. Two strategies to improve the reading performance of large objects in OSDs are proposed in this paper. Firstly, local relativity of data blocks on disk is utilized to reconstruct the data block index addresses as Successive data Blocks Index Array (SDBIA). SDBIA will be taken as one attribute of the object and then the performance of getting the data block index address of large objects will be improved obviously. Secondly, successive blocks allocation strategy is adopted. The experiment shows that these two strategies are effective for the performance of reading large objects.

关键词： File systems Educational technology Logic arrays Computer science Laboratories data storage systems Computer science education Performance analysis Linux data structures

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A framework for accessing general object storage

A framework for accessing general object storage

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

作者： Qun Liu Dan Feng Qin Ling-jun Zeng Ling-fang Key Laboratory of Data Storage System Ministry of EducationCollege of Computer Huazhong University of Science슠and슠Technology Wuhan China

With computer application popularizing and storage capacity increasing, research for NAS and SAN storage system are gradually turning to OBS. The OBS will become the next wave of network storage technology. In this paper a framework for accessing general object storage (GOS) is presented. The GOS system adopts a basic unit called storage device object (SDO) and proposes an access model that contains upper layer, middle layer and lower layer. It not only enriches the concept of object, but also gives a compatible object interface in the network storage systems. So it allows applications to access to different SDO according their attributes. Therefore it is more universal

关键词： storage area networks File servers Application software Protocols Network servers data structures Image storage File systems Laboratories data storage systems

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