With the growing scale of storage system, the traditional storage strategies can not match the requirements of storage
system. The attribute controlled object storage has brought about new revolution. Moreover, storage system must handle
an increasing variety of data storage needs. QoSS (Quality of Storage Service) has therefore become an important issue.
Based on a review of the current development in the object storage and QoS, a QoSS management framework and some
optimization strategies are proposed. We implement QoSS efficiently involved with the optimizations in object-based
storage systems in accordance with the proposed framework. An attribute-managed storage system with guaranteed
QoSS based on extension of OSD and iSCSI protocols is developed. We mainly extend the T10 OSD standard on the
delay and bandwidth attributes. The test results show that the proposed strategy can achieve the optimization of the
storage systems.
KEYWORDS: Data storage, Holography, Optical storage, Digital video discs, Magnetism, Holographic data storage systems, LCDs, Charge-coupled devices, Digital holography, Super resolution
Nowadays digital information is growing increasingly faster than ever before and data storage has been becoming an
indispensable branch of computer science and technology. Based on a review of the current development of data storage,
a novel view on the classification and feature of data storage has been put forward. Several ideas on the mass and high
density are analyzed. The theory and key technology of holographic storage is introduced from the perspective of
application.
The structured overlay networks based on DHT provide a decentralized, self-organizing substrate for building the large
distributed systems such as file sharing and data storage. However, in most of these systems, many problems still remain
to be solved regarding system scalability, network proximity and so on. In this paper, we present a novel routing protocol
called PBHC. By combining hierarchical DHT algorithm with a data proximity mechanism PBHC minimizes the intracluster
access traffic and boosts the local access ratio in heterogeneous networks environment. The simulation results
show PBHC can significantly improve the routing performance and scalability of the P2P storage system.
With the explosive growth of digital information, storage systems are becoming larger and more complicated. Especially
in large scale storage systems, they must be able to deliver satisfactory I/O performance (availability, reliability, etc.)
under both expected and unexpected workloads, and handle data with real timeliness requirements. However, typical
management methods of mass storage systems cannot meet these requirements. One solution is using Quality of Service
(QoS) approaches in object-based storage systems. These QoS approaches include Quality of Storage Service (QoSS)
framework and QoSS improvements. After researching the QoS requirements and the various data access
characterizations in different applications, we designed a QoSS management framework. And then according to this
framework, we gave some improvements to efficiently realize QoSS in object-based storage systems. To demonstrate the
effectiveness of our proposed solution, we developed a prototype of Attribute-managed Storage System with QoSS
(AM-QoSS) by extending both OSD and iSCSI protocols. The measurement results finally show that the proposed QoS
management approach achieves optimization of storage systems, such as higher performance and better guaranteed QoS.
KEYWORDS: Modulation, Optical storage, Computer programming, Optical discs, Digital video discs, Field programmable gate arrays, Control systems, Data storage, Forward error correction, Intellectual property
In digital storage system, the aim of channel coding is to improve efficiency and reliability of the channel. In order to
improve the capacity and quality for optical storage system, the study on the modulation code is significant. A new RLL
(2, 12; 8, 15) run-length limited code is presented. The construction method of the code is discussed and the procedures
in encoding and decoding of the code are also given. The major characteristic parameters of different run-length limited
codes are compared; the decoder is implemented based on FPGA. The RLL(2, 12; 8, 15) code with high modulation rate,
namely high encoding efficient, is fit for high density optical storage systems. The study of modulation code for high-density
optical discs with independent intellectual property rights is also of great significance.
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