Facultad Regional Santa Fe

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Author: search.filters.author.Pessolani, PabloSubject: search.filters.subject.Distributed Systems

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    An architecture model for a distributed virtualization system
    (2019-10) Pessolani, Pablo
    The Thesis is about an architecture model for a Distributed Virtualization System, which could expand a virtual execution environment from a single physical machine to several nodes of a cluster. With current virtualization technologies, computing power and resource usage of Virtual Machines (or Containers) are limited to the physical machine where they run. To deliver high levels of performance and scalability, cloud applications are usually partitioned in several Virtual Machines (or Containers) located on different nodes of a virtualization cluster. Developers often use that processing model because the same instance of the operating system is not available on each node where their components run. The proposed architecture model is suitable for new trends in software development because it is inherently distributed. It combines and integrates Virtualization and Distributed Operating Systems technologies with the benefits of both worlds, providing the same isolated instance of a Virtual Operating System on each cluster node. Although it requires the introduction of changes in existing operating systems, thousands of legacy applications would not require modifications to obtain their benefits. A Distributed Virtualization System is suitable to deliver high-performance cloud services with provider-class features, such as high-availability, replication, migration, and load balancing. Furthermore, it is able to concurrently run several isolated instances of different guest Virtual Operating Systems, allocating a subset of nodes for each instance and sharing nodes between them. Currently, a prototype is running on a cluster of commodity hardware provided with two kinds of Virtual Operating Systems tailored for internet services (web server) as a proof of concept.
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    Service migration in a distributed virtualization system
    (IX Conference on Cloud Computing Conference, Big Data & Emerging Topics, 2021-06) Pessolani, Pablo; Re, Luis Santiago; Fleitas, Tomás Andrés
    Cloud applications are usually formed by different components (microservices) that may be located in different virtual and/or physical computers. To achieve the desired level of performance, availability, scalability and robustness in this kind of system is necessary to develop and maintain a complex set of infrastructure configurations. Another approach would be to use a Distributed Virtualization System (DVS) that provides a transparent mechanism that each component could use to communicate with others, regardless of their location and thus, avoiding the potential problems and complexity added by their distributed execution. This communication mechanism already has useful features for developing distributed applications, such as replication support (active and passive) and process migration. In general, process migration is used when a node in the cluster is overloaded or it has been scheduled to be disconnected in order to save energy or to do maintenance tasks in it. When this occurs, it is very important that any application using any service running in that node does not end up being affected by the migration. This article describes the mechanisms used for the migration of server processes between nodes of a DVS cluster in a transparent way for client and server processes, and doing special focus on how to solve the problem of keeping client/server communications active even when the server process location has changed.