The new VMware vSphere 6.0, recently announced, increase all configuration maximums to new limits (compared to the 5.5 and previous versions). Maybe we can say with no limit, or at least, to be serious, with really huge numbers compared to the actual needs and the existing compunting power. Those new limits are both for scalability aspect, but also to fit with possible performance requirements, considering that a bigger number of business critical applications are going in the virtual environment.