After the Pfister [ 6 ] and Buyya [ 7 ] Computing cluster is: “A cluster is a kind of parallel and distributed system, which consists of a collection of interconnected laptops that work together as a single integrated computing resource. ‖ Buyya defined as follows one of the popular definitions of grids at the Grid Planet Conference, San Jose, USA: and the aggregation of ̳ autonomous resources distributed geographically dynamically, based on their availability, performance, performance, costs and user service quality requirements. ‖ Buyya also defined cloud computing as follows: “A cloud is a kind of parallel and distributed system, which consists of a collection of interconnected and virtualized computers that are dynamically provided and presented as one or more unique computing resources based on its service level agreements, which ‖ based on service level agreements established by service negotiation. , The paid utility model and virtualization are the key factors of cloud computing. Cloud computing is listed according to National Standards and Technologies (NIST) as shown below: – Access to demand to the so-called convenient network. Computing ability of the common cluster of configurable computers. A network that is released and available quickly, with less effort in management. The cloud model consists of 1. Five main features (self-service on demand, extended network access, combination of resources, accelerated resilience, calculated services) 2.
The models of four deployment clouds are public and private clouds, as well as community and hybrid clouds) 3. Three service models (service represented by Platform, i.e. Google App Engine, a service represented by Infrastructure, i.e. Amazon EC2/S3, and software-represented service, i.e. salesforce.com) The structure of the entire cloud computing process is as follows [ 1 ]: Users or brokers simply communicate with the utility computer system on applications to send applications to the first level (Fig. 1). Admission Control (AC) is performed at the second level of Service Request Examiner (SRE). The allocation of resources is then carried out by the administrative level below the (SRE). Finally, resources or services are allocated by the service provider or resource. Steinke, 1997.
Acquisition of service levels, network 12: 77-81. LoM2HiS (Metrics to High Level Service Agreement) is a resource-level validation system that provides an average value for converting resource measurements into settings placed in a high-level service.