Chapter 1
Server Hardware Installation and Management
Course: Comptia Server Sk0 005
Subject: Comptiaserver Sk0 005
Chapter: Server Administration
Virtualization abstracts physical hardware into logical units, allowing multiple virtual machines (VMs) to run on a single physical host. This optimizes hardware utilization, simplifies management, increases scalability, and supports high availability and disaster recovery strategies.
1. Host vs. Guest
Host:
- The host machine is the physical hardware that runs the virtualization software called the hypervisor.
- It provides the underlying CPU cycles, RAM, disk storage, and network bandwidth.
- Hosts typically have powerful processors (often multi-core, multi-CPU), large amounts of RAM, and fast storage (NVMe, SSD, or RAID arrays).
- The hypervisor installed on the host manages and allocates resources to multiple virtual machines.
- There are two main types of hypervisors:
Type 1 (Bare-metal hypervisors): Installed directly on the physical hardware without an underlying OS. Examples: VMware ESXi, Microsoft Hyper-V Server, KVM.