Greater support for industry-standard device drivers
No extra charge for most high-end functionality
Single console for all editions
Up to 16 vCPUs and 128GB per VM
Support via forums and the XenSource community.
A Windows application only, not a web console
Supported tools are not as advanced as VMware.
XenServer has the most features of any free hypervisor, is easiest to install and manage, has excellent performance and VMs support up to 16 vCPUs.
Microsoft Windows Server 2008 R2 SP1 Hyper-V
Best integration with Microsoft infrastructure
A strong set of enterprise features, due to be improved soon
Strong development focus from Microsoft.
Large cluster management can be more difficult
Only four vCPUs and 64GB of RAM per VM.
It's still not as mature as VMware or XenServer, but it has a lot of momentum. Integration in a Windows environment will make this a strong hypervisor for those running mainly Microsoft.
VMware vSphere ESXi 5
Easy to install and manage from vSphere Client
Many advanced features are available
Good support via forums
Many certified engineers are available in the workforce
Tools are available to assist in the migration to virtual.
Limited in terms of managing the virtual infrastructure
Requires upgrade to vCenter server for advanced features
Many advanced features are only available with additional plug-ins.
ESXi 5 is the market leader, which shows in the maturity of its product, the polish of its console and the vast number of support tools available. But it comes at a cost.
Oracle VirtualBox 4.1.18
Free, open source and small 20MB file size
Stable with very good usability
Can boot from .iso and simplified file sharing
Runs on and hosts a very wide variety of OSes.
Limited USB support
Less refined than more established competitors
Not all host ports are available under the VM
Number of guests limited by PC host
Doesn't support drag and drop.
VirtualBox is an inexpensive path for an individual or SMB to explore virtualisation. If your needs extend past VirtualBox running a production server and web server on a pair of VMs on a single server, you'll probably want to use another product.
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