Bare metal servers are a form of cloud services in which the user rents a physical machine from a provider that is not shared with any other tenants.
Unlike traditional cloud computing, which is based on virtual machines, bare metal servers do not come with a hypervisor pre-installed and give the user complete control over their server infrastructure.
With a bare metal server, because users get complete control over the physical machine, they have the flexibility to choose their own operating system, avoid the “noisy neighbor” challenges of shared infrastructure, and finely tune hardware and software for specific, often data-intensive, workloads.
The primary benefits of bare metal servers are based on the access end users have to hardware resources. The advantages of this approach include the following:
Bare metal servers have an important role in the infrastructure mix for many companies due to their unique combination of performance and control.
The terms 'bare metal server' and 'dedicated server' are sometimes used interchangeably, and bare metal servers are in fact dedicated services. But while they are similar, they are not synonymous. The difference is less about the servers themselves, and more about how they are delivered by the service provider.
Historically, dedicated servers have been associated with long provisioning times, billing increments of months or years, and often low-end or even dated hardware.
The concept of bare metal servers rose as a response to the sometimes negative associations with dedicated servers and hosting. Providers specializing in bare metal servers offer dedicated hardware in something much closer to a cloud service model, with provisioning times in minutes, by the hours, and hardware ranging from inexpensive to top-of-the-line components, including graphic processing units (GPUs). Dedicated servers remain as a lower-priced alternative for users who don’t require these attributes.
Today, available compute options for cloud services go beyond just bare metal and cloud servers. Containers are becoming a default infrastructure choice for many cloud-native applications. PaaS (Platform-as-a-Service) has an important niche of the applications market for developers that don’t want to manage an OS or runtime environment. And serverless computing is emerging as the model of choice for cloud purists.
But the comparison most users still gravitate toward when evaluating dedicated or bare metal servers is the comparison to virtual servers, and for most companies, the criteria for choice are application- or workload-specific. It is extremely common for a company to use a mix of dedicated/bare metal and virtualized resources across their cloud environment.
Virtual servers are the more common model of cloud compute because they offer greater resource density, faster provisioning times, and the ability to scale up and down quickly as needs dictate. But dedicated or bare metal servers are the right fit for a few primary use cases that take advantage of the combination of attributes centered around dedicated resources, greater processing power, and more consistent disk and network I/O performance:
Cloud computing transforms IT infrastructure into a utility, letting you ‘plug in' to computing resources and applications over the internet, without installing and maintaining them on-premises.
A virtual machine is a virtual representation, or emulation, of a physical computer. Virtualization makes it possible to create multiple virtual machines on a single physical computer.