Varman, Peter J.2013-03-082013-03-082012Wang, Hui. "Nested QoS: Providing flexible SLAs in shared storage systems." (2012) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/70483">https://hdl.handle.net/1911/70483</a>.https://hdl.handle.net/1911/70483The increasing popularity of storage and server consolidation introduces new challenges for resource management, capacity provisioning, and application performance guaranteeing. In addition, the bursty nature of storage workloads results in a large gap between the peak and the average capacity required to meet response time bounds, leading to low overall server utilization and high cost. This situation is driving the development of elastic QoS models that allow clients greater flexibility in adopting SLAs tailored to their workload characteristics and performance requirements, while allowing the service provider opportunities to optimize provisioning and scheduling decisions. This thesis presents a novel service model, called the Nested QoS model, for multiplexing concurrent bursty workloads in shared storage systems. The solution employs two strategies together: systematically classifying requests with a graduated QoS and flexibly scheduling the classified portions. The results show that the Nested QoS model provides (i) performance isolation and strong performance guarantees for both well-behaved and misbehaving workloads; (2) a flexible and auditable elastic SLA definition; and (3) improved server utilization.81 p.application/pdfengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.Applied sciencesComputer engineeringElectrical engineeringComputer scienceThesisWangHTHESIS E.E. 2012 WANG