“…This approach creates an increase in indirect costs (electric energy, larger number of servers, network complexity, maintenance etc.) because the main objective is only to keep the system working, without making a better use of resources (Ma et al, 2012;Marrone and Nardone, 2015;Ichikawa and Komoda, 2016). Similarly, this issue can be approached by a combination of various methods and algorithms that enable the scaling of the system in order to ensure its availability (Corsava and Getov, 2003;Frachtenberg et al, 2002).…”