VM migration is one of the issues that can be considered while handling insufficient resources in cloud.

Few issues

1. Number of objectives- single, bi, multi objectives, many objectives

2. Static vs dynamic VM allocation

3. Single cloud Vs many cloud

Dynamic Vm Allocation by Proactive solutions.

Please refer to these works:

http://ieeexplore.ieee.org/abstract/document/7498443/

https://www.igi-global.com/article/...m-pasa-for-cloud-application/185770

Article Auto-scaling Web Applications in Clouds: A Cost-Aware Approach

You can refer following articles

http://ieeexplore.ieee.org/document/6906022/

Reducing the energy consumption of cloud data centers remains an important issue when considering scheduling, delaying and migrating cloud workloads. You can refer to this article for an overview of the problem:

http://mehiardabbagh.com/papers/Network14.pdf