Słota, Renata
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Item type:Article, Access status: Open Access , Policy-based sla storagemanagement model fordistributeddata storage services(Wydawnictwa AGH, 2018) Nikolow, Darin; Słota, Renata; Polak, Stanisław; Pogoda, Marek; Kitowski, JacekThere is high demand for storage related services supporting scientists in their research activities. Those services are expected to provide not only capacity but also features allowing for more exible and cost ecient usage. Such features include easy multiplatform data access, long term data retention, support for performance and cost dierentiating of SLA restricted data access. The paper presents a policy-based SLA storage management model for distributed data storage services. The model allows for automated management of distributed data aimed at QoS provisioning with no strict resource reservation. The problem of providing users with the required QoS requirements is complex, and therefore the model implements heuristic approach for solving it. The corresponding system architecture, metrics and methods for SLA focused storage management are developed and tested in a real, nationwide environment. Keywords distributed storage systems, quality of service, service level agreement, management model, heuristics.Item type:Article, Access status: Open Access , Towards transparent data access with context awareness(Wydawnictwa AGH, 2018) Wrzeszcz, Michał; Słota, Renata; Kitowski, JacekOpen-data research is an important factor accelerating the production and analysis of scientific results as well as worldwide collaboration, still, very little data is being shared at scale. The aim of this article is to analyze existing data-access solutions along with their usage limitations. After analyzing the existing solutions and data-access stakeholder needs, the authors propose their own vision of a data-access model.Item type:Article, Access status: Open Access , The ATLAS experiment on-line monitoring and filtering as an example of real-time application(Wydawnictwa AGH, 2008) Korcyl, Krzysztof; Szymocha, Tadeusz; Funika, Włodzimierz; Kitowski, Jacek; Słota, Renata; Bałos, Kazimierz; Dutka, Łukasz; Guzy, Krzysztof; Kryza, Tomir; Pieczykolan, JanThe ATLAS detector, recording LHC particles' interactions, produces events with rate of 40 MHz and size of 1.6 MB. The processes with new and interesting physics phenomena are very rare, thus an efficient on-line filtering system (trigger) is necessary. The asynchronous part of that system relays on few thousands of computing nodes running the filtering software. Applying refined filtering criteria results in increase of processing times what may lead to lack of processing resources installed on CERN site. We propose extension to this part of the system based on submission of the real-time filtering tasks into the Grid.Item type:Article, Access status: Open Access , Computer aided distributed post-stroke rehabilitation environment(Wydawnictwa AGH, 2016) Wrzeszcz, Michał; Otfinowski, Janusz Stanisław; Słota, Renata; Kitowski, JacekIn this paper we present the results of a two-year study aimed at developing a full-fledged computer environment supporting post-stroke rehabilitation. The system was designed by a team of computer scientists, psychologists and physiotherapists. It adopts a holistic approach to rehabilitation. In order to extend the rehabilitation process, the applied methods include a remote rehabilitation stage which can be carried out of at the patient’s home. The paper presents a distributed system architecture as well as results achieved by patients prior to and following a three-month therapy based on the presented system.Item type:Article, Access status: Open Access , Resource storage management model for ensuring quality of service in the cloud archive systems(Wydawnictwa AGH, 2014) Kapanowski, Mariusz; Słota, Renata; Kitowski, JacekNowadays, service providers offer a lot of IT services in the public or private cloud. Clients can buy various kinds of services, such as SaaS, PaaS, etc. Recently, Backup as a Service (BaaS), a variety of SaaS, was introduced there. At the moment, there are several different BaaS’s available to archive data in the cloud, but they provide only a basic level of service quality. In this 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 an SLA level which can be offered at the basic or higher level of quality. The storage systems (typically HSM), which are distributed between several Data Centers, are built based on disk arrays, VTL’s, and tape libraries. The RSMM model does not assume bandwidth reservation or control, but rather is focused on management of storage resources.Item type:Article, Access status: Open Access , SLA-oriented semi-automatic management of data storage and applications in distributed environments(Wydawnictwa AGH, 2010) Król, Dariusz; Funika, Włodzimierz; Słota, Renata; Kitowski, JacekIn this paper we describe a semi-automatic programming framework for supporting users with managing the deployment of distributed applications along with storing large amounts of data in order to maintain Quality of Service in highly dynamic and distributed environments, e.g., Grid. The Polish national PL-GRID project aims to provide Polish science with both hardware and software infrastructures which will allow scientists to perform complex simulations and in-silico experiments on a scale greater than ever before. We highlight the issues and challenges related to data storage strategies that arise at the analysis stage of user requirements coming from different areas of science. Next we present a solution to the discussed issues along with a description of sample usage scenarios. At the end we provide remarks on the current status of the implementation work and some results from the tests performed.Item type:Article, Access status: Open Access , Group membership management framework for decentralized collaborative systems(Wydawnictwa AGH, 2022) Opioła, Łukasz; Jarosz, Kamil; Dutka, Łukasz; Słota, Renata; Kitowski, JacekScientific and commercial endeavors could benefit from cross-organizational, decentralized collaboration, which becomes the key to innovation. This work addresses one of its challenges, namely efficient access control to assets for distributed data processing among autonomous data centers. We propose a group membership management framework dedicated for realizing access control in decentralized environments. Its novelty lies in a synergy of two concepts: a decentralized knowledge base and an incremental indexing scheme, both assuming a P2P architecture, where each peer retains autonomy and has full control over the choice of peers it cooperates with. The extent of exchanged information is reduced to the minimum required for user collaboration and assumes limited trust between peers. The indexing scheme is optimized for read-intensive scenarios by offering fast queries – look-ups in precomputed indices. The index precomputation increases the complexity of update operations, but their performance is arguably sufficient for large organizations, as shown by conducted tests. We believe that our framework is a major contribution towards decentralized, cross-organizational collaboration.Item type:Article, Access status: Open Access , Management methods in SLA-aware distributed storage systems(Wydawnictwa AGH, 2012) Nikolow, Darin; Słota, Renata; Lakovic, Danilo; Winiarczyk, Paweł; Pogoda, Marek; Kitowski, JacekTraditional data storage systems provide access to user’s data on the “best effort” basis. While this paradigm is sufficient in many use cases it becomes an obstacle for applications with Quality of Service (QoS) constraints. Service Level Agreement (SLA) is a part of the contract agreed between the service provider and the client and contains a set of well defined QoS requirements regarding the provided service and the penalties applied in case of violations. In the paper we propose a set of SLA parameters and QoS metrics relevant to data storage processes and the management methods necessary for avoiding SLA violations. A key assumption in the proposed approach is that the underlying distributed storage system does not provide functionality for resource or bandwidth reservation for a given client request.Item type:Article, Access status: Open Access , A toolkit for storage QoS provisioning for data-intensive applications(Wydawnictwa AGH, 2012) Słota, Renata; Król, Dariusz; Skałkowski, Kornel; Orzechowski, Michał; Nikolow, Darin; Kryza, Bartosz; Wrzeszcz, Michał; Kitowski, JacekThis paper describes a programming toolkit developed in the PL-Grid project, named QStorMan, which supports storage QoS provisioning for data-intensive applications in distributed environments. QStorMan exploits knowledgeoriented methods for matching storage resources to non-functional requirements, which are defined for a data-intensive application. In order to support various usage scenarios, QStorMan provides two interfaces, such as programming libraries or a web portal. The interfaces allow to define the requirements either directly in an application source code or by using an intuitive graphical interface. The first way provides finer granularity, e.g., each portion of data processed by an application can define a different set of requirements. The second method is aimed at legacy applications support, which source code can not be modified. The toolkit has been evaluated using synthetic benchmarks and the production infrastructure of PL-Grid, in particular its storage infrastructure, which utilizes the Lustre file system.