workload traces and are passed to the data center. The data center processes requests, consolidates and deconsolidates VMs when necessary. Figure 4 shows the basic scenario of simulation for our proposed algorithms.

![image](SiSc.eps){width="60.00000%"}

Physical Resources
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We ran a simulation with an arrangement on three of the same type physical machines. The configuration of the physical machines are Intel$^{\circledR}$  core^TM^ 2 Duo CPU E8400 3.00 GHz processor and with 500GB storage, 4 GB Ram, Windows 7 with 32-bit OS and with 250 GB storage.

Performance Metrics
===================

The Performance Measured had been established by following the three main performance metrics. These metrics are proposed by Beloglazov and Buyya \[18\].

Energy Consumption
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The total energy consumption is measured by taking into consideration the total energy consumption made by a data center during the application workload. The unit for energy consumption is kilo watt per hour (kWh).

SLA Violation
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The SLA violation (SLAV) percentage is defined as the percentage of SLA violation events which are relatively in accordance to the total number of the processed time frames. SLA violation is calculated through Performance Degradation due to Migration (PDM) and SLA Time per Active Host (SLATAH).

Number of VM Migrations
-----------------------

