Κέντρα δεδομένων : εισαγωγή και ανάλυση προβλημάτων
Data centers are gradually gaining a significant share in computer science since they constitute the basis for a wide range of services and applications used in education, communications and government systems. Advances in technology as well as the rising complexity of information have set the need for constant evolution and development of data centers. Furthermore, it is important to mention that even specific grades/ratings and organizations have been established in order to classify data centers according to the size and the type of services offered. The role of these organizations is to set commonly agreed rules and standards to the smooth operation of data centers. However, it is obvious that the evolution of data centers has also caused a range of issues and problems that need to be addressed. The aim of this master thesis is to provide high-level information on the concept of data centers, focusing on their features and requirements as well as on the most commonly faced issues/problems. More specifically, presented information focuses on architectural types and aspects, congestion issues, security issues, the tcp incast as well as energy issues along with their respective proposed solutions. This thesis constitutes an introductory work on data centers covering key aspects, therefore providing a solid basis for future research.