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Fault-tolerance of services has received great attention for years, yet it is not clear how this can be done efficiently for different types of services. Current research focuses on finding strategies to provide fault-tolerance using commodity hardware and as independent of the service and transparent to clients as possible. We propose a replication system to provide fault-tolerance for any type of...
Services' high-availability has received great attention for years, yet it is not clear how this can achieved efficiently for different types of services. Current research focuses on finding strategies to provide high-availability using commodity hardware and as independent of the service and transparent to the clients as possible. This paper investigates strategies to provide high-availability for...
The paper presents a new software strategy for generating true random numbers, by creating several threads and letting them compete unsynchronized for a shared variable, whose value is read-modified-updated by each thread repeatedly. The generated sequence of random numbers consists of the final values of the shared variable. Our strategy is based on the functionality of the operating system's thread...
Most operating system kernels support functionality extension at runtime, but when it comes to upgrade or update the functionality of a component or module, it must be removed from the kernel before loading the new version of that component. To unload a component, all applications and other kernel components that are using it must be stopped to avoid inconsistency. This paper presents a hotswappable...
Research has been done to enhance traditional file systems with database-like capabilities. Existing solutions store additional meta-data, describing files' contents and interrelationships, but provide access to the new file system's capabilities only through a specialized interface. Most of them don't support user-defined relationships among files, and if they do, this is not true for file categories...
This paper presents a strategy to develop an infrastructure for reliable distribution of data in Grids. We used the data replication services of Globus Toolkit 4.0, but extended their functionality in order to improve the reliability of the overall data distribution in different failure scenarios. Our solution makes the data distribution process automatic, based on distribution patterns the user provides...
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