What do changes made to resources available in a parent pool affect in a resource pool hierarchy?
Sibling and child pools
Root resource pools
Page 47 from vsphere-esxi-vcenter-server-50-resource-management-guide.pdf
A resource pool can contain child resource pools, virtual machines, or both. You can create a hierarchy of shared resources. The resource pools at a higher level are called parent resource pools. Resource pools and virtual machines that are at the same level are called siblings. The cluster itself represents the root resource pool. If you do not create child resource pools, only the root resource pools exist.
In the following example, RP-QA is the parent resource pool for RP-QA-UI. RP-Marketing and RP-QA are siblings. The three virtual machines immediately below RP-Marketing are also siblings.
Figure 8-1. Parents, Children, and Siblings in Resource Pool Hierarchy