There are several physical data centers in cloud environment with hundreds
or thousands of computers. Virtualization is the key technology to make
cloud computing feasible. It separates virtual machines in a way that each of
these so-called virtualized machines can be configured on a number of hosts
according to the type of user application. It is also possible to dynamically
alter the allocated resources of a virtual machine. Different methods of
energy saving in data centers can be divided into three general categories:
1) methods based on load balancing of resources; 2) using hardware facilities
for scheduling; 3) considering thermal characteristics of the environment.
This paper focuses on load balancing methods as they act dynamically
because of their dependence on the current behavior of system. By taking a
detailed look on previous methods, we provide a hybrid method which
enables us to save energy through finding a suitable configuration for virtual
machines placement and considering special features of virtual environments
for scheduling and balancing dynamic loads by live migration method.

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