In starting with cloud and virtualized systems, it’s important to understand how to apply Hypervisor. Starting to work with a virtual machine may be advantageous as it’s an efficient and isolated duplicate of a real machine. It is highly available and it enables fast disaster recovery.
Virtualization technology also expands the capabilities of the hardware, helps to control IT-related costs, and helps you improve your system’s reliability and security.
In technical terms, a hypervisor is a hardware virtualization technique that allows multiple guest operating systems (OS) to run on a single host system at the same time. The guest OS shares the hardware of the host computer, such that each OS appears to have its own processor, memory, and other hardware resources.
A hypervisor is also known as a virtual machine manager (VMM).
In popping the History, The term hypervisor was first coined in 1956 by IBM to refer to software programs distributed with IBM RPQ for the IBM 360/65. The hypervisor program installed on the computer allowed the sharing of its memory.
As an integral component, hypervisor allows for physical devices to share their resources amongst virtual machines running as guests onto the top of that physical hardware. To further clarify the technology, it’s important to analyze a few key definitions:
Type I Hypervisor (Bare Metal Virtualization)
This type of hypervisor deployed as a bare-metal installation. This means that the first thing to be installed on a server as the operating system will be the hypervisor. The benefit of this software is that the hypervisor will communicate directly with the underlying physical server hardware. Those resources are then para-virtualized and delivered to the running VMs. This is the preferred method for many production systems.
Type II Hypervisor (Hosted Virtualization)
This model is also known as a hosted hypervisor. The software is not installed onto the bare-metal but instead, is loaded on top of an already live operating system. For example, a server running Windows Server 2008R2 can have VMware Workstation 8 installed on top of that OS. Although there is an extra hop for the resources to take when they pass through to the VM – the latency is minimal and with today’s modern software enhancements, the hypervisor can still perform optimally.
How to find the best fit for infrastructure?
Understand the need and create Checklist on the following basis:
Preference for Performance
For high-performance need and advanced resource control best option for virtualization is going to be a bare metal hypervisor. The reason for this is that the bare metal hypervisors use the smallest amount of resource overhead while at the same time giving you the advantage of being able to prioritize or restrict virtual machine (VM) usage and guarantee VM resource allocation.
On the other hand, hosted hypervisors normally have limited or even no resource control. This means that VMs need to compete with each other to grab resources. Another limiting factor is that hosted hypervisors, unlike their bare metal cousins, frequently have heavy resource overhead penalties. This is particularly the case when tools, operating system services, and applications are also running on the guest system.
Ease of Use
Hosted virtualization hypervisors are that they are easy to install, straightforward to use and do not require specialist skills to maintain. The fact that a specialist is not needed in your IT team to maintain these servers has obvious economic benefits. Installation of the majority of hosted hypervisors is similar to that of a windows application and therefore can be considered intuitive. On the other hand, bare-metal virtualization hypervisors are normally quite straightforward to install but things start getting tricky when it is time to configure the hypervisor.
Consider for High Availability
Two choices of where to place your high availability, either in the virtualization hypervisors themselves or to deploy load balancers, both virtual or hardware appliances that offer this functionality. High availability ensures business continuation even in the event that a virtualized hypervisor fails. VMotion from VMware is considered to one of the best high availability solutions as it comes packed with features fault tolerance is also included. Microsoft Hyper-V has improved its high availability options recently but is considered by some to be a less integrated solution compared with VMware. XenServer from Citrix needs to rely on other third-party products to be set up in high availability mode. Hosted virtualization hypervisors don’t normally come with high availability options, for this reason, you should consider using dedicated virtual or physical load balancers to deal with any VM failures that may occur.
Management Options for Virtualization Hypervisors
Essentially better set of management and automation tools for bare-metal virtualization hypervisors required. Consoles can be centralized to provide a single dashboard that makes it easier to monitor a larger number of VMs and hosts. A second advantage for the bare metal option is a large number of 3rd party automation and management tools that are available too. Hosted hypervisors need to be individually managed and this limitation makes management that much more time consuming and laborious when you have large infrastructures.
Faststream Technologies is a leading solution provider of cloud, Virtualization, IoT. For further details on Hypervisor, contact us at firstname.lastname@example.org.