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Cloud Management and a Programming Model Case Study
19.11.1 Types of SLABog'liq Cloud Computing dardingni sev, 2-topshiriq. O'zbek tili, 1-mavzu Zamonaviy AKT ning tushunchasi va tasnifi, expedia hisoboti, natija - 2022-10-28T091429.322, yangi MULOQOT psixologiyasi, AKT Sillabus KI(Kunduzgi) (1), Я хотел, Dropbox (1), Korporativ boshqaruv prinsiplar siyosat va amaliyot O‘rmonov 2019, 1111-dars, AXBOROT TEXNOLOGIYALARI HAQIDA TUSHUNCHA (2), Ekonometrik II amaliy (2), dsfdsg, dfvdf339
Cloud Management and a Programming Model Case Study
19.11.1 Types of SLA
From the perspectives of application hosting by consumers into cloud, SLA can be divided
in two parts where one part assures infrastructural service quality and the other does the
application.
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Infrastructure SLA and
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Application SLA
Infrastructure SLA deals with infrastructure-related issues like network connectivity, server
availability, packet loss issues etc. For example, one Infrastructure SLA statement may state that
packet loss will not exceed 1 percent in one calendar month or data center network availability
will be at least 99.99 percent of the entire duration in one calendar month.
Application SLA deals with different performance metrics of applications to maintain the
desired quality of services. It may address issues like latency of web server, latency of database
server, application response time and others.
19.11.2 SLA Lifecycle
In the process of establishing and maintaining the agreement on terms and conditions, each
SLA passes through a lifecycle consisting of a sequence of phases. Figure 19.8 shows the phases
in the lifecycle of SLA which are listed below:
1. Contract definition: Service providers define SLAs corresponding to their service offerings
by using the standard templates. Customized SLAs for individual customers or enterprises,
if required in future, are derived from these base SLA templates.
2. Publishing and discovery: The base service offerings of service providers are published and
the appropriate promotion is done so that consumers become aware about those services.
Consumers must find those services on searching the service catalog along with other
competitive offerings. Consumers can then shortlist the most appropriate one and later on, go
after further negotiation for any necessary customization with the corresponding provider.
3. Negotiation: Once the customer shortlists service and corresponding service provider, the
SLA terms and conditions are the next important things to be mutually agreed upon before
signing the final service contract. For a standard service offering, this phase is automated.
For customizable service offerings, this phase is manual and negotiable. In this case, the
consumers should have clear idea about their requirements and service providers must
analyze the service needs of the consumers. At the end of this phase, a mutually agreed
SLA is prepared and is signed by both parties.
4. Operationalization: A SLA in operation may involve three different activities like
SLA monitoring,
SLA accounting and
SLA enforcement.
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