Masuyuki Takeuchi

Research: Distributed file management techniques based on an autonomous decentralized system concept

Distributed computer systems have been the subject of a large amount of research and development. From the standpoint of system construction and expansion, it is necessary that a computer system is flexible and tolerant enough for a change of system structure. A computer system is also required to be easily operated by users regardless of its structure and status. This paper presents techniques for file management in a distributed computer system to fulfil these requirements based on the Autonomous Decentralized System Concept. The proposed techniques achieve the autonomy of each computer unit and autonomous cooperation among these computer units in a distributed file system. These techniques realize flexible fault-tolerance of each file according to the degree of its importance. Additionally, one of the applications of the proposed techniques is also shown in this paper.

Autonomous decentralized file system and its application

From the standpoint of system construction/expansion, it is required that a computer system is flexible and tolerant for change of the system structure and has software productivity. A computer system is also required to be easily operated by users regardless of its structure and status. In order to achieve these requirements, the EVERUN (EVEr RUNning) computer system has been developed based on the autonomous decentralized system concept. The distributed file system for this EVERUN computer system is proposed. This file system realizes flexible fault-tolerance, and easy expansion, operation and maintenance. The EVERUN computer system including this file system has been applied to production management systems and so on. The effectiveness of this computer system has been verified.<<ETX>>