Recently, I had the opportunity to test a nested lab deployment on Oracle’s Ravello Cloud Service. If you are unfamiliar with Oracle’s Ravello offering, it enables you to deploy your VMware or KVM workloads on Oracle Public Cloud, AWS, or Google Cloud. Ravello seamlessly runs your environment on top of their own nested hypervisor, HVX. HVX, in turn, is run on resources provisioned by Oracle, AWS, or Google Cloud. Utilizing Ravello’s HVX hypervisor allows the underlying cloud infrastructure to behave like your traditional datacenter; thus, enabling you to run your VMware workloads without modification.
Due to additional layers of abstraction, nested environments are prone to performance bottlenecks compared to bare metal offerings like VMware Cloud on AWS. To address this issue, Oracle recently announced the ability to run HVX on top of bare metal servers with the Oracle Cloud Infrastructure (OCI); therefore, eliminating a layer of abstraction.
Ravello on OCI or AWS/Google Cloud
Depending on the cloud region used for deployment, one of three nested virtualization approaches are used for running your workload; software-assisted, hardware-assisted, and direct on bare metal.
Software-assisted nested virtualization is Ravello’s traditional approach to running workloads on AWS or Google Cloud. In these instances, the underlying hardware virtualization extensions are not typically exposed to Ravello. Therefore, HVX uses binary translation with direct execution to run workloads.
Hardware-assisted nested virtualization leverages exposed virtualization extensions on the underlying cloud hardware. Running on Oracle’s Cloud Infrastructure (OCI), HVX has complete access to these hardware extensions, which increases performance over software-assisted nested virtualization.
Oracle Cloud Infrastructure (OCI) also supports the ability to run directly on bare metal servers. This results in increased performance as there is no need for any additional software or hardware translations.
Regardless of region or performance, Ravello provides a variety of use-cases for your workloads including development, testing, sales demos, POCs, and even VCAP lab preparations.
In this post, we are going to install VMware ESXi 6.5 on Ravello’s Cloud Service for testing purposes. The ability to run additional hypervisors (Nested²) such as VMware ESXi, KVM, or Hyper-V is beneficial in testing or lab prep scenarios.