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The objective of the OLA is to present a clear, concise and measurable description of the service provider's internal support relationships. OLA is sometimes expanded to other phrases but they all have the same meaning: organizational-level agreement; operating-level agreement; operations-level agreement. OLA is not a substitute for an SLA.
The SLA is the entire agreement that specifies what service is to be provided, how it is supported, times, locations, costs, performance, and responsibilities of the parties involved. SLOs are specific measurable characteristics of the SLA such as availability, throughput, frequency, response time, or quality.
The output received by the customer as a result of the service provided is the main focus of the service level agreement. Service level agreements are also defined at different levels: Customer-based SLA: An agreement with an individual customer group, covering all the services they use. For example, an SLA between a supplier (IT service ...
In software architecture, these attributed are known as "architectural characteristic" or non-functional requirements. Note that it's software architects' responsibility to match these attributes with business requirements and user requirements. Note that synchronous communication between software architectural components, entangles them and ...
A space-based architecture (SBA) is an approach to distributed computing systems where the various components interact with each other by exchanging tuples or entries via one or more shared spaces. This is contrasted with the more common message queuing service approaches where the various components interact with each other by exchanging ...
An instruction set architecture (ISA) is an abstract model of a computer, also referred to as computer architecture.A realization of an ISA is called an implementation.An ISA permits multiple implementations that may vary in performance, physical size, and monetary cost (among other things); because the ISA serves as the interface between software and hardware.
SLIs form the basis of service level objectives (SLOs), which in turn form the basis of service level agreements (SLAs); [1] an SLI can be called an SLA metric (also customer service metric, or simply service metric). Though every system is different in the services provided, often common SLIs are used.
When a requirement specifies a software system’s quality attributes, refers to its core features, imposes constraints on it, or defines the environment in which it will run, it is likely to be architecturally significant. See discussion of design vs. architecture under software architecture for additional criteria of architectural significance.