Bare metal server is a single-tenant physical computer dedicated to a single user. Unlike virtual machines (VMs), there is no hypervisor layer between the hardware and the operating system. This architecture allows the OS to run directly on the server's processor and memory units.
How it works
The user maintains exclusive access to all hardware components, including CPU cycles, RAM, and storage bandwidth. This eliminates the "noisy neighbor" problem common in multi-tenant cloud environments where other users' workloads can degrade performance. It provides predictable latency and high throughput for resource-heavy applications.
- Direct access to hardware-level features like
Intel VT-xorNVMedirect pass-through. - Support for custom kernels and non-standard operating systems.
- Enhanced security through physical isolation of data and workloads.
Bare metal is the standard choice for high-performance computing (HPC), large-scale databases, and real-time data processing. For instance, deploying a Kubernetes cluster directly on bare metal nodes instead of VMs can reduce networking overhead by up to 20%, significantly improving the response time of microservices.