Applications can be categorized into three basic groups:
- Green: In this group, applications can be virtualized right out of the box. They have great performance with no tuning required.
- Yellow: In this group, applications have good performance but require some tuning and attention for optimal performance.
- Red: In this group, applications exceed the capabilities of the virtual platform and should not be virtualized. Also, it includes applications in which the software vendor does not support virtualization.
The vast majority of applications are green, which means that no performance tuning is required. Yellow applications are smaller but still a significant group. There are very few red applications (that is, applications that do not virtualize).