A 2 thOS: availability analysis and optimisation in SLAs
Summary (1 min read)
Introduction
- A framework to calculate the availability of partially outsourced IT services in the presence of SLAs and to achieve a cost-optimal choice of availability levels for outsourced IT components while guaranteeing a target availability level for the service.the authors.
- Figure 4 shows one possible scheduling for the failure of the components on which Service1 depends on, resulting in Service1 having an availability of αService1 (0.984).
- To this end the authors distinguish among three types of nodes in a dependency graph: target availability nodes, variable availability nodes and given availability nodes.
- The analysis engine solves the availability analysis problem, described in Section 3.
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References
97 citations
"A 2 thOS: availability analysis and..." refers methods in this paper
...Although integrating the A2THOS engines in one of these tools would be useful, this was not possible: Relex and BlockSim are commercial tools, Coral is mostly a MatLab library without a GUI, and Galileo is free software, but not open source....
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...Galileo [20], Coral [21], Relex [22] and BlockSim [23] are tools operating with dynamic FTs....
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83 citations
"A 2 thOS: availability analysis and..." refers background in this paper
...Burgess [5] proposes to use promise theory [6] as a framework for describing the inter‐company dependency (outsourcing) and the free corporate collaboration in a market economy that occurs in the context of a service‐oriented architecture....
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68 citations
"A 2 thOS: availability analysis and..." refers background in this paper
...Appendices A and B present the proof of one of the theorems we introduce and the representation capabilities of our model with respect to RBDs, respectively....
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...FTs and RBDs are the most used ones....
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...The same behaviour is achieved in RBDs through SERIES/PARALLEL compositions....
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...We share this limitation with other well‐known modelling techniques, such as traditional fault trees (FTs) and reliability block diagrams (RBDs)....
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...To solve this problem, FTs and RBDs have been extended into dynamic FTs [16] and dynamic RBDs [17], allowing one to model maintenance‐related issues....
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54 citations
"A 2 thOS: availability analysis and..." refers methods or result in this paper
...To carry out this step we follow the same procedure we adopted for Oxygen (and described in more detail in our previous publication [31])....
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...The procedure we followed is very similar to the one we described in our previous publication [31]....
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33 citations
"A 2 thOS: availability analysis and..." refers methods in this paper
...[14] use a UML representation (although in this second case the authors do not provide the mathematical support for reliability analysis)....
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