& 16%\
20/04/2011 & 1033 & 10.43% & 15.21% & 2% & 4% & 12%\

Experimental Setup
------------------

Each node of data center is modelled with a dual core CPU and the performance of each core is equivalent to 1860 MIPS for HP ProLiant ML110 G4 server and 2660 MIPS for HP ProLiant ML110 G5 servers. Each server had been modelled with 1 GbPS network bandwidth. The types of VM were exhibited as Amazon EC2 instances and were listed in Table 5. The VMs of the data center were deployed with single core CPU because the workload data comes from single core VMs. Initially, system resources were occupied as VM types by the VMs. However, during the life time simulation, fewer system resources that were occupied had been consistent with workload data for a dynamic VM consolidation.

[L[3cm]{}|C[2cm]{}|C[2cm]{}]{} **Instance Type** & **CPU Speed MIPS** & **Storage GB**\
High-CPU Medium Instance & 2500 & 0.85\
Extra Large Instance & 2000 & 3.75\
Small Instance & 1000 & 1.7\
Micro Instance & 500 & 613\

Simulation Scenario
-------------------

The modelled data center is connected to the internet and user requests are generated from the internet. User requests are generated according to the 