published_or_final_version / Computer Science / Master / Master of Philosophy

No description available.

Report (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Abstract. Includes bibliographical references (leaves 138-139). Also available via the Internet.

Thesis (Ph.D.) - University of Queensland, 2005. / Includes bibliography.

Thesis (M.B.A.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf 140-142).

published_or_final_version / Business Administration / Master / Master of Business Administration

M.B.A. / Electronic Data Systems (EDS) Africa is part of EDS International, one of the largest outsourcing companies in the world. EDS's clients expect EDS to have the required knowledge and decision-making skills to ensure that their Wide area NETWORK (WAN) redundancy is in line with the business requirement. This is a careful balance between spending money on redundancy compared with the cost of WAN downtime to the business. This implies that EDS's management must realise when the WAN design is not optimal. A decision must then be made to change the design to incorporate the correct redundancy. EDS Africa incurs substantial costs related to services supplied by Telkom (the only Telecommunication company allowed to rent WAN data lines to customers in South Africa at this point in time. They are owned by the government.). At present EDS is unable to measure Telkom's up-times using proper historical data, and using applied business statistics. (Tony Webster, 1998). Telkom does not provide EDS with any service level guarantees. When a company out-sources business to EDS, the two parties usually sign a Service Level Agreement (SLA). This agreement will state the network up-time and conditions of conducting business between the two parties. EDS generally excludes Telkom problems from the SLA, as they cannot be held responsible for problems that are outside of their control...

Thesis (M.S.)--West Virginia University, 2002. / Title from document title page. Document formatted into pages; contains ix, 129 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 125-129).

The combination of traditional process migration and the new virtualization technology enables mobility of virtual machines and resource provisioning within data centers. While applied to wide area network (WAN), a traditional migration algorithm has to adjust itself according to the various WAN situations and VM status. This thesis identifies four performance measurements of a VM migration: total migration time, downtime, remote up time and performance degradation. It observes that the total migration time and the remote up time of traditional pre-copy over WAN is too long to tolerate. This thesis claims that even for WAN, post-copy could be used to improve the total migration time and remote up time, only by introducing tolerable, predictable and controllable performance degradation. The adaptiveness of the migration algorithm is concerned. It proposes a hybrid solution of pre-copy and post-copy, both for memory and storage, to do the migration. In the hybrid solution, a fraction of memory (Mfrac) and a fraction of storage (Sfrac) are migrated in the pre-copy and freeze-and-copy phase, and the remaining are migrated in the post-copy phase. A model-based solution with the help of profiling is proposed to adaptively find the best combination of Mfrac and Sfrac. The evaluation part suggests that the proposed solution could adapt to different application behaviors and network conditions. / published_or_final_version / Computer Science / Master / Master of Philosophy

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