HCI runs directly on standard commercial servers, utilizing a lightweight, hardened hypervisor to transform local hardware resources into shared, software-defined resource pools. It consists of four core, tightly integrated software modules:

aSV (Compute Virtualization): Virtualizes CPU and memory resources, providing an elastic, high-performance computing environment that rivals bare-metal performance through kernel optimizations.

aSAN (Storage Virtualization): A distributed block storage system that aggregates local disks (SSD/HDD) into a shared storage pool. It eliminates the need for external SAN arrays by providing enterprise-grade reliability, performance tiering, and data redundancy via software.

aNET (Network Virtualization): Implements a complete Software-Defined Networking (SDN) stack. It creates logical network topologies (switches, routers, load balancers) decoupled from physical network hardware, utilizing overlay technologies (VXLAN).

aSecurity (Security Virtualization): Provides intrinsic security services embedded within the virtualization kernel. This includes distributed firewalls for micro-segmentation, protecting East-West traffic flows that traditional perimeter firewalls cannot see.