Virtualization has become a popular way to make more efficient use of server resources within both private data centers and public cloud platforms. Hypervisors XenServer 6.0, ESXi 4.1 and KVM (Ubuntu 12.04) are installed as hosts in the respective clusters and their performances have been evaluated in detail by using SIGAR Framework, Passmark and NetPerf. In the experiment, CloudStack 4.0.2 (open source cloud computing software) is used to create a private cloud, in which management server is installed on Ubuntu 12.04 – 64 bit operating system. This paper conducts different performance tests on three hypervisors XenServer, ESXi and KVM and results are gathered using SIGAR API (System Information Gatherer and Reporter) along with Passmark benchmark suite. It is novel idea to compare them in the private cloud environment. Hypervisors do come in Paravirtualized, Full Virtualized and Hybrid flavors. It is interesting to study how different Hypervisors perform in the Private Cloud. A virtualization layer which provides an infrastructural support to multiple virtual machines above it by virtualizing hardware resources such as CPU, Memory, Disk and NIC is called a Hypervisor. Virtualization Technology plays major role in the success of cloud computing. One is internet and second important one is virtualization technology.
To make cloud computing model Practical and to have essential characters like rapid elasticity, resource pooling, on demand access and measured service, two prominent technologies are required.
As a result, we see that such approach helps to identify preventive security countermeasures that have to be considered at the earlier stage before real attacks occur. Secondly, it applies quality-based methodology for security analyses. Hence, this paper firstly analyses malicious environment of virtualization technology. In addition to that, to better structure the risks we based Ishikawa method on traditional security model, STRIDE Model, proposed by Microsoft. In this research, we apply Ishikawa approach, method from Quality Management System in order to identify many possible causes and factors for hypervisor security risks. New approaches should be applied in order to be able to meet new security challenges of technology. System in effective way as it used to be in the past. The traditional security methods cannot be applied any more to secure However, cloud environment faces new security challenges as the architecture of virtualized environments differs dramatically from non-virtualized. Nowadays Virtualization is an underlying technology in cloud computing that simplifies data center management improves corporate resource utilization, minimizes IT hardware costs.
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