When one virtual machine consumes so much of the host resources that other virtual machines on the host cannot perform their intended functions, a Denial of Service (DoS) might occur. To prevent a virtual machine from causing a DoS, use host resource management features such as setting shares and limits to control the server resources that a virtual machine consumes.

By default, all virtual machines on a host share resources equally.

Use shares or reservations to guarantee resources to critical virtual machines.

Limits constrain resource consumption by virtual machines that have a greater risk of being exploited or attacked, or that run applications that are known to have the potential to greatly consume resources.

See the vSphere Resource Management documentation for information about shares and limits.