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153 results on '"Renata Slota"'

1. Resource Storage Management Model For Ensuring Quality Of Service In The Cloud Archive Systems

Author

Mariusz Kapanowski, Renata Slota, and Jacek Kitowski

Subjects
Computer Sciencestorage, backup, cloud, management, QoS, SLACloud Backup and Archivization, Electronic computers. Computer science, QA75.5-76.95
Abstract

Nowadays, service providers offer a lot of IT services in the public or private cloud. The client can buy various kinds of services like SaaS, PaaS, etc. Recently there was introduced Backup as a Service (BaaS) as a variety of SaaS. At the moment there are available several different BaaSes for archiving the data in the cloud, but they provide only a basic level of service quality. In the paper we propose a model which ensures QoS for BaaS and some methods for management of storage resources aimed at achieving the required SLA. This model introduces a set of parameters responsible for SLA level which can be offered on the basic or higher level of quality. The storage systems (typically HSM), which are distributed between several Data Centres, are built based on disk arrays, VTLs, and tape libraries. The RSMM model does not assume bandwidth reservation or control, but is rather focused on the management of storage resources.

Published
2014
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2. Management Methods In Sla-Aware Distributed Storage Systems

Author

Darin Nikolow, Renata Slota, Danilo Lakovic, Paweł Winiarczyk, Marek Pogoda, and Jacek Kitowski

Subjects
Service level agreements, mass storage systems, quality of service, Electronic computers. Computer science, QA75.5-76.95
Abstract

Traditional data storage systems provide access to user’s data on the “besteffort” basis. While this paradigm is sufficient in many use cases it becomesan obstacle for applications with Quality of Service (QoS) constraints. ServiceLevel Agreement (SLA) is a part of the contract agreed between the serviceprovider and the client and contains a set of well defined QoS requirementsregarding the provided service and the penalties applied in case of violations.In the paper we propose a set of SLA parameters and QoS metrics relevantto data storage processes and the management methods necessary for avoidingSLA violations. A key assumption in the proposed approach is that the underlyingdistributed storage system does not provide functionality for resource orbandwidth reservation for a given client request.

Published
2012
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19. New approach to global data access in computational infrastructures

Author

Michał Wrzeszcz, Łukasz Dutka, Jacek Kitowski, and Renata Slota

Subjects
Computer Networks and Communications, business.industry, Computer science, Distributed computing, Scale (chemistry), Usability, Metadata, Data access, Hardware and Architecture, Overhead (business), Scalability, Context awareness, Representation (mathematics), business, Software
Abstract

Data access and management on a large, global scale is currently at the center of scientific interest. This follows from the need for data access from multi- and hybrid-cloud applications. In most cases existing solutions provide sufficient functionality to scale computing resources but scaling resources in terms of efficient data access e.g. for data-intensive applications is still not comprehensively resolved. In this paper, we present a new approach to global data access that supports the execution of data-intensive applications on globally distributed heterogeneous resources provided and managed by independent providers. We identify the functionality, representation, and processing of contextual information in the form of metadata, and the organization of data, resulting in four models describing the details of the approach. An experimental evaluation of this approach is discussed. We show overheads for single- and multi-site environments, system scalability, and usage of context awareness to achieve desired behavior proving insignificant overhead introduced by the system. The results confirm usability of the approach to supporting computations in heterogeneous environments with unified access to data distributed worldwide achieved by using broad contextual information.

Published
2021

42. Knowledge Management for Organisationally Mobile Public Employees.

Author

Simon C. Lambert, Simona Stringa, Gianni Viano, Jacek Kitowski, Renata Slota, Krzysztof Krawczyk, Mariusz Dziewierz, Sabine Delaître, Miguel Bermejo Oroz, Ana Conde Gómez, Ladislav Hluchý, Zoltán Balogh 0001, Michal Laclavik, M. Soledad Fuentes Caparrós, Maria Fassone, and Vito Contursi

Published
2003
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