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Title

SLA MANAGEMENT IN A COLLABORATIVE NETWORK OF FEDERATED CLOUDS: THE

CLOUDLEND

Faculty Advisor

Dr. Mohamed Adel Serhani

Defense Date

20 November 2016

Abstract

Cloud services have always promised to be available, flexible, and speedy. However, not a single Cloud

provider can deliver such promises to their distinctly demanding customers. Cloud providers have a

constrained geographical presence, and are willing to invest in infrastructure only when it is profitable

to them. Cloud federation is a concept that collectively combines segregated Cloud services to create

an extended pool of resources for Clouds to competently deliver their promised level of services. This

dissertation is concerned with studying the governing aspects related to the federation of Clouds through

collaborative networking. The main objective of this dissertation is to define a framework for a Cloud

network that considers balancing the trade-offs among customers’ various quality of service (QoS)

requirements, as well as providers› resources utilization. We propose a network of federated Clouds,

CloudLend, that creates a platform for Cloud providers to collaborate, and for customers to expand their

service selections. We also define and specify a service level agreement (SLA) management model in order

to govern and administer the relationships established between different Cloud services in CloudLend. We

define a multi-level SLA specification model to annotate and describe QoS terms, in addition to a game

theory-based automated SLA negotiation model that supports both customers and providers in negotiating

SLA terms, and guiding them towards signing a contract. We also define an adaptive agent-based SLA

monitoring model which identifies the root causes of SLA violations, and impartially distributes any updates

and changes in established SLAs to all relevant entities. Formal verification proved that our proposed

framework assures customers with maximum optimized guarantees to their QoS requirements, in addition

to supporting Cloud providers to make informed resource utilization decisions. Additionally, simulation

results demonstrate the effectiveness of our SLA management model. Our proposed CloudLend network

and its SLA management model paves the way to resource sharing among different Cloud providers,

which allows for the providers’ lock-in constraints to be broken, allowing effortless migration of customers’

applications across different providers whenever is needed.

Dissertation

ASMA OBAID HAMAD SAEED SUBAIH

AL FALASI

Department of Information Systems and Security

College of Information Technology

Apr 27, 2020