[Virtualization] 03. VirtualBox and VMware: From Desktop to Enterprise

• Introduction
• VirtualBox Architecture
  • Core Structure
  • Virtual GPU Options
  • Guest Additions
  • VirtualBox GPU Limitations
• VMware Product Family
  • Product Lineup
  • VMware Workstation
  • VMware Fusion (macOS)
  • VMware ESXi (Type 1)
• vSphere Ecosystem
  • Core Features
  • vMotion Workflow
• VMware vGPU Support
  • NVIDIA GRID Integration
  • Supported Technologies
• Product Comparison Table
• vSphere 9.0 Licensing Changes
• Hands-On: VBoxManage CLI

Introduction

VirtualBox and VMware are among the most widely used virtualization products. VirtualBox represents open-source desktop virtualization, while VMware offers a full lineup from desktop (Workstation/Fusion) to enterprise (ESXi/vSphere).

VirtualBox Architecture

Core Structure

VirtualBox is an open-source Type 2 hypervisor managed by Oracle.

+-----------------------------------------------+
|           VirtualBox Manager (GUI/CLI)          |
+-----------------------------------------------+
|  VM 1         |  VM 2         |  VM 3          |
|  Guest Adds   |  Guest Adds   |  (No Adds)     |
+-----------------------------------------------+
|           VirtualBox VMM Engine                 |
|  (Ring-0 Driver + User-space Components)       |
+-----------------------------------------------+
|           Host OS (Windows/macOS/Linux)         |
+-----------------------------------------------+
|           Physical Hardware                     |
+-----------------------------------------------+

Key Features:

• Type 2 hypervisor (runs on top of host OS)
• Leverages Intel VT-x / AMD-V hardware virtualization
• Cross-platform: Windows, macOS, Linux, Solaris
• Free + open-source (GPLv3, Extension Pack is PUEL license)
• Automatable via VBoxManage CLI

Virtual GPU Options

Guest Additions

Guest Additions is a paravirtualized driver package installed in the guest OS.

Provided Features:

• Mouse pointer integration (seamless switching)
• Shared folders (host-guest file sharing)
• Automatic screen resolution adjustment
• Time synchronization
• Clipboard sharing
• Drag and drop
• 3D acceleration (experimental OpenGL ~3.0, D3D experimental)

VirtualBox GPU Limitations

VirtualBox has clear GPU virtualization limitations.

• No GPU Passthrough: Experimental PCI passthrough was removed in v6.1.0
• No vGPU Support: No integration with NVIDIA GRID or AMD MxGPU
• No Vulkan Support: Only OpenGL ~3.0 available
• Max VRAM: 256MB (insufficient for GPU-intensive workloads)
• Video Encode/Decode: No hardware acceleration

[VirtualBox GPU Feature Summary]

GPU Passthrough:   Not supported
vGPU:              Not supported
Vulkan:            Not supported
OpenGL:            ~3.0 (experimental)
DirectX:           Experimental (partial D3D 8/9)
Max VRAM:          256MB
Monitors:          Up to 8 (2D only)

VMware Product Family

Product Lineup

+-----------------------------------------------------+
|                   VMware Products                     |
+-----------------------------------------------------+
|                                                       |
|  [Desktop]              [Enterprise]                  |
|                                                       |
|  Workstation Pro/Player  ESXi (Type 1 Hypervisor)    |
|  (Windows/Linux)         vCenter Server               |
|                          vSphere Suite                |
|  Fusion Pro/Player       vSAN                        |
|  (macOS)                 NSX (Network Virtualization)|
|                          Aria (Monitoring)            |
+-----------------------------------------------------+

VMware Workstation

+-----------------------------------------+
|  VM 1 (Windows)  |  VM 2 (Ubuntu)       |
|  NAT / Bridged   |  Host-Only / Custom  |
+-----------------------------------------+
|  VMware Workstation Pro                  |
|  (Type 2 Hypervisor)                    |
+-----------------------------------------+
|  Host OS (Windows / Linux)              |
+-----------------------------------------+
|  Hardware (VT-x/AMD-V required)         |
+-----------------------------------------+

Key Features:

• Snapshots and clones (Linked Clone for disk savings)
• Virtual Network Editor (NAT, bridged, host-only, custom)
• Unity mode (integrate guest apps into host desktop)
• Container support via vctl
• UEFI Secure Boot support

VMware Fusion (macOS)

• macOS-exclusive Type 2 hypervisor
• Native Apple Silicon (M1/M2/M3/M4) support
• Run ARM-based Windows 11 and Linux
• Metal-based 3D graphics acceleration
• macOS guest VM support (within license terms)

VMware ESXi (Type 1)

+---------------------------------------------------+
| VM 1        | VM 2        | VM 3        | VM 4    |
| (Production)| (Database)  | (Web App)   | (Test)  |
+---------------------------------------------------+
|                VMkernel                            |
|  +----------+  +----------+  +----------+         |
|  | VMFS 6   |  | vDS      |  | Firewall |         |
|  | Storage  |  | Network  |  | Module   |         |
|  +----------+  +----------+  +----------+         |
+---------------------------------------------------+
|           Physical Hardware                        |
|  (CPU, RAM, HBA/NIC, PCIe Devices)               |
+---------------------------------------------------+

VMkernel Core Components:

vSphere Ecosystem

vSphere is the combination of ESXi + vCenter Server, forming an enterprise virtualization platform.

Core Features

[vSphere Feature Architecture]

+------------------+
|   vCenter Server |  <-- Central Management
+--------+---------+
         |
    +----+----+----+----+
    |    |    |    |    |
  ESXi ESXi ESXi ESXi ESXi  <-- Cluster
    |    |    |    |    |
    +----+----+----+----+
         |
   Shared Storage (vSAN / SAN / NFS)

vMotion Workflow

Source ESXi Host              Destination ESXi Host
+------------------+         +------------------+
| VM (Running)     |         | VM (Preparing)   |
| Memory Pages     | ------> | Memory Copy      |
| (Pre-copy)       |         | (Iterative)      |
+------------------+         +------------------+
        |                            |
        |    1. Pre-copy memory       |
        |    2. Iterative dirty pages |
        |    3. Brief VM pause (~ms)  |
        |    4. Transfer final state  |
        |    5. Resume on destination |
        v                            v
   Shared Storage (SAN / vSAN / NFS)

VMware vGPU Support

NVIDIA GRID Integration

VMware ESXi fully supports NVIDIA GRID/vGPU.

+----------+ +----------+ +----------+
| VM 1     | | VM 2     | | VM 3     |
| vGPU     | | vGPU     | | vGPU     |
| Q-series | | C-series | | B-series |
+----------+ +----------+ +----------+
|         vGPU Manager (ESXi)        |
+------------------------------------+
|         Physical GPU               |
|   (NVIDIA A100/A30/L40S/etc.)     |
+------------------------------------+

vGPU Performance:

• Achieves 88-96% of native performance (workload-dependent)
• Per-profile VRAM and encoder allocation
• GPU resource management via QoS policies

Supported Technologies

Product Comparison Table

vSphere 9.0 Licensing Changes

Following Broadcom's acquisition of VMware in 2024, the licensing model changed significantly.

Key Changes:

• Perpetual licenses eliminated; subscription-only
• Individual product sales discontinued (cannot purchase ESXi alone)
• Consolidated into two bundles:
  • VVF (VMware vSphere Foundation): Base virtualization + vSAN
  • VCF (VMware Cloud Foundation): Full SDDC stack (vSphere + vSAN + NSX + Aria)
• Switched from per-socket to per-core licensing
• Free ESXi license (vSphere Hypervisor) discontinued

[Licensing Change Summary]

Before (VMware):
  ESXi Free  |  vSphere Std  |  vSphere Ent+  |  Individual purchase
  (free)     |  (perpetual)  |  (perpetual)    |

After (Broadcom):
  VVF (vSphere Foundation)  |  VCF (Cloud Foundation)
  (subscription, per-core)   |  (subscription, per-core)
  No individual ESXi purchase, no free license

This shift has led many organizations to evaluate alternatives such as Proxmox VE and Nutanix AHV.

Hands-On: VBoxManage CLI

# Create a VM
VBoxManage createvm --name "test-ubuntu" --ostype "Ubuntu_64" --register

# Configure memory and vCPUs
VBoxManage modifyvm "test-ubuntu" --memory 4096 --cpus 4

# Create and attach virtual disk
VBoxManage createmedium disk --filename "test-ubuntu.vdi" --size 50000
VBoxManage storagectl "test-ubuntu" --name "SATA" --add sata
VBoxManage storageattach "test-ubuntu" --storagectl "SATA" \
  --port 0 --device 0 --type hdd --medium "test-ubuntu.vdi"

# Attach ISO
VBoxManage storageattach "test-ubuntu" --storagectl "SATA" \
  --port 1 --device 0 --type dvddrive --medium ubuntu.iso

# Configure network (NAT -> Bridge)
VBoxManage modifyvm "test-ubuntu" --nic1 bridged --bridgeadapter1 en0

# Start VM
VBoxManage startvm "test-ubuntu" --type headless

# Take snapshot
VBoxManage snapshot "test-ubuntu" take "clean-install"

# List VMs
VBoxManage list vms
VBoxManage list runningvms