Solutions for SLA Management in Utility Computing Systems Sample Clauses

Solutions for SLA Management in Utility Computing Systems. This section introduces solutions for the problems presented in the previous section. Six SLA manage- ment languages and frameworks are analyzed, because they can be used as solutions in multiple steps of SLA lifecycle. 3.2.1. SLA Management Frameworks and Languages Bilateral Protocol: (Xxxxxxxx et al. 2008) presented a negotiation mechanism for advanced resource reservation. It is a protocol for negotiating SLAs based on Rubinsteins Alternating Offers protocol for bargaining between parties. Any party is allowed to modify the proposal in order to reach a mutually- agreed contract. The authors implemented this protocol by using the Gridbus Broker on the customer‟s side and Aneka on the provider‟s side. Web services enable platform independence, and are therefore used to communicate between consumers and providers because the Gridbus Broker is implemented in Java, and Aneka is a .Net based enterprise Grid. The advantage of these high level languages is that they are object oriented and web services enable semantic definition. Thus, this protocol supports SLA com- ponent reuse, and type and semantic definition. WS-Agreement: Open Grid Forum (OGF) has defined a standard for the creation and the specification of SLAs called Web Services Agreement Specification (WS-Agreement) (Xxxxxxxx et al. 2007). It is a language and a protocol for establishing, negotiating, and managing agreements on the usage of services at runtime between providers and consumers. It uses an XML-based language for specifying the nature of an agreement template, which facilitates discovery of compatible providers. Its interaction is based on request and response. Moreover, it helps parties in exposing their status, so SLA violation can be dynami- cally managed and verified. Originally the language did not support negotiation and currently it has been complemented. WS-Agreement Negotiation, which lies on the top of WS-Agreement and describes the re/negotiation of the SLA. Its main feature is the robust signaling protocol for the negotiation. Web Service Level Agreement (WSLA): WSLA (Xxxxxx et al. 2003) is a framework developed by IBM to specify and monitor SLA for Web Services. It provides a formal XML schema based language to ex- press SLAs, and an architecture to interpret this language at runtime. It can measure, and monitor QoS parameters and report violations to the party. It separates monitoring clauses from contractual terms for outsourcing purposes. It provides the capability to crea...
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Solutions for SLA Management in Utility Computing Systems. This section introduces solutions for the problems presented in the previous section. Six SLA manage- ment languages and frameworks are analyzed, because they can be used as solutions in multiple steps of SLA lifecycle. 3.2.1. SLA Management Frameworks and Languages Bilateral Protocol: (Xxxxxxxx et. al. 2008) presented a negotiation mechanism for advanced resource reservation. It is a protocol for negotiating SLAs based on Rubinsteins Alternating Offers protocol for bargaining between parties. Any party is allowed to modify the proposal in order to reach a mutually- agreed contract. The authors implemented this protocol by using the Gridbus Broker on the customer‟s side and Aneka on the provider‟s side. Web services enable platform independence, and are therefore used to communicate between consumers and providers because the Gridbus Broker is implemented in Java, and Aneka is a .Net based enterprise Grid. The advantage of these high level languages is that they are object oriented and web services enable semantic definition. Thus, this protocol supports SLA com- ponent reuse, and type and semantic definition. WS-Agreement: Open Grid Forum (OGF) has defined a standard for the creation and the specification of SLAs called Web Services Agreement Specification (WS-Agreement) (Andrieux et. al. 2007). It is a language and a protocol for establishing, negotiating, and managing agreements on the usage of services Web Service Level Agreement (WSLA): WSLA (Xxxxxx et. al. 2003) is a framework developed by IBM to specify and monitor SLA for Web Services. It provides a formal XML schema based language to ex- press SLAs, and architecture to interpret this language at runtime. It can measure, and monitor QoS para- meters and report violations to the parties. It separates monitoring clauses from contractual terms for out- sourcing purposes. It provides the capability to create new metrics over existing metrics to implement multiple QoS parameters (Xxxxxx et. al. 2003). However, the semantic of metrics is not formally defined, hence, there are limitations for the creation of new terms based on existing terms. WSOL: Web Service Offerings Language (WSOL) defines a syntax for service offers‟ interaction (Xxxxxxxxxxx et. al. 2005). It provides template instantiation and reuse of definitions (Xxxxx et. al. 2009). WSOL and WSLA support definition of management information and actions, such as violation notifica- tions. However, they are not defined by a formal semantic. WSOL an...

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