In a DRS cluster, you can power on a single virtual machine and receive initial placement recommendations.
When you power on a single virtual machine, you have two types of initial placement recommendations:
A single virtual machine is being powered on and no prerequisite steps are needed.
The user is presented with a list of mutually exclusive initial placement recommendations for the virtual machine. You can select only one.
A single virtual machine is being powered on, but prerequisite actions are required.
These actions include powering on a host in standby mode or the migration of other virtual machines from one host to another. In this case, the recommendations provided have multiple lines, showing each of the prerequisite actions. The user can either accept this entire recommendation or cancel powering on the virtual machine.