Читать книгу Cloud Computing Solutions - Группа авторов - Страница 43

Numerous specialists from industry and scholarly circles have given numerous perspectives on cloud and its computational highlights. Some of them are given below.

Buyya et al. have stated that “Cloud is a parallel and dispensed framework consisting of a group of associated and virtualized personal computers that are progressively allocated and introduced as at least one bound together computational artifice in view of service-level agreements (SLA) built up through arrangement amongst the CSPs and shoppers.” [2].

McKinsey & Company expressed that “Clouds are hardware-based services offering compute, network and storage capacity where: 1) Hardware management is highly abstracted from the buyer. 2) Buyers incur infrastructure costs as variable OPEX. 3) Infrastructure capacity is highly elastic (up or down).” [3].

As per Vaquero et al.,: “Clouds are a large pool of easily usable and accessible virtualized resources (such as hardware, development platforms and/or services). These resources can be dynamically assigned to adjust to a variable load, allowing also for an optimum resource utilization. This pool of resources is typically exploited by a pay-per-use model in which guarantees are offered by the Infrastructure Provider by means of customized SLAs.” [4].

The National Institute of Standards and Technology (NIST)^a characterizes cloud computing as “a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction.” [5].

^a https://www.nist.gov

Armbrust et al. called cloud “datacenter hardware and software” which provide services [6]. The fundamental point of cloud computing is to consolidate the physical and computational resources and to send appropriate computational tasks to numerous dispersed personal computers.

In this digital period, customers basically prefer the pay-per-use method [7, 8].