In this paper, we show two process allocation schemes to tolerate multiple faults when the primary-backup replication method is used. The rst scheme, called multiple backup scheme, is running multiple backup processes for each process to tolerate multiple faults. The second scheme, called regenerative backup scheme, is running only one backup process for each process, but regenerates backup pro...

This paper presents the framework and function of an agent system developed for Field Server to manage Web-based sensor network. This system consisting of an agent program, program configuration files, and a Web interface, can easily and autonomously manage Web-based sensor nodes via the Internet. It can perform simple function such as monitoring to more complex and intelligent operations to ad...

In this paper, we show two process allocation schemes to tolerate multiple faults when the primary-backup replication method is used. The first scheme, called multiple backup scheme, is running multiple backup processes for each process to tolerate multiple faults. The second scheme, called regenerative backup scheme, is running only one backup process for each process, but re-generates backup ...

This paper describes two similar user-initiated methods to backup and restore PC workstations over an ethernet network. The first method concerns ‘‘PC Hardware All Alike,’’ or the backup and restoring of sets of identical disk images across many identical systems. The second method is the backup and restoring of ‘‘PC Hardware All Different,’’ which manages unique disk images on individual syste...

In a primary-backup system, transaction processing takes place at the primary and the log records generated are propagated to the backup which uses them to reconstruct a recent state of the database. If the primary fails, the backup takes over transaction processing without causing users to observe a breach in service. Existing approaches can be broadly classi ed as 2-safe or 1-safe based on wh...

We are keeping an increasing amount of valuable data in digital format only. Offsite backup systems are ideal for ensuring that such irreplaceable personal information will be preserved in the face of disk failures, unexpected disastrous events and operator mistakes. It is time to bring offsite backup solutions, traditionally a luxury to only deep pocketed enterprises, to the masses of home use...

While NoSQL databases are gaining popularity for business applications, they pose unique challenges towards backup and recovery. Our solution, BARNS addresses these challenges, namely taking: a) cluster consistent backup and ensuring repair free restore, b) storage efficient backups, and c) topology oblivious backup and restore. Due to eventual consistency semantics of these databases, traditio...

A hard disk has, in recent years, become an essential component for a personal computer as well as a work station. A hard disk stores a variety of files, which are daily updated. The files in a hard disk are, however, lost because ofhuman errors and afailure of the hard disk. This is called a hard disk failure. In order to protect usfrom such a serions loss, it is important to make a backup cop...

With the widespread use of real-time applications (VoIP, IPTV, Video conference, etc.) in Internet, protection and resource optimization become increasingly desired. Network protection aims to decrease the interruption time of communications by precomputing backup paths capable to receive and route traffics of affected primary paths upon failures. Resource optimization is achieved by improving ...