Browsing by Author "Chindele, Evaldo dos Prazeres Saraiva"
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- Performance Implications For the Use of Virtual Machines Versus Shielded Virtual Machines in High-Availability Virtualized InfrastructuresPublication . Chindele, Evaldo dos Prazeres Saraiva; Freire, Mário MarquesUse of virtualization in datacenter or service providers or even in cloud computing environments brings many benefits. Virtualization, whether it is for services, applications or servers, is no longer a trend to be a reality in many industries and areas, whether in or outside the technology area. Therefore, with this emergent use of virtualization companies have been asking a lot about the performance and security of using virtual machines in a highly availability infrastructures. Controlling the access to Virtual Machines is a security issues that all the hypervisors haves, such as, VMware vSphere, Hyper-V or KVM. To make virtual machines more secure Microsoft has introduced the concept of Shielded virtual machines. Taking this into account, this dissertation presents a study on key concepts behind virtual machines, Guarded Fabric, Host Guardian Service, Guarded Hosts and shielded virtual machines. A Shielded VM is a Generation 2 feature (supported on Windows Server 2012 and later) that comes with a virtual Trusted Platform Module (TPM), which can only run on healthy and approved hosts in the fabric and is encrypted using BitLocker. In order to support our study an experimental bed test has been setup, involving a failover cluster with native virtualization at the hardware level with Windows Server 2016 Hyper-V. In the test environment, a failover clustering, FreeNAS Storage, ISCSI Target, VMs, Guarded Fabric and Shielded virtual machines have been implemented and configured. After the implementation of the bed test, a set of tests and experiments haves been made in order to study the performance implications for the use of virtual machines versus shielded virtual machine in High Availability Virtualized Infrastructures. Finally, an analysis at the results worked through the tests has been made, according to the Background made in the first part and the bed test deployed. A set of experiments has been made in virtual machines and shielded virtual machines in order to evaluate its performance in terms of CPU, RAM and writing speed. The results show that the use of shielded virtual machines leads to a small degradation of performance compared to the use of regular virtual machines, but, on the other hand, it has also been shown that the shielded virtual machines allows to restrict access to the virtual machines only for run on trusted hosts, and prevent unauthorized administrators and malwares from compromising the virtual machine.