  We propose a novel framework to detect changes in the performance behavior of
an IaaS service. The proposed framework leverages the concept of the IaaS
signature to represent an IaaS service's long-term performance behavior. A new
type of performance signature called categorical IaaS signature is introduced
to represent the performance behavior more accurately. A novel performance
noise model is proposed to accurately identify IaaS performance noise and
accurate changes in the performance behavior of an IaaS service. A set of
experiments based on real-world datasets is carried out to evaluate the
effectiveness of the proposed framework.
