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Grouping of resources.
Separation of resources.
A cloud server's compute parameters depend on the number of CPUs and the amount of RAM used. The ability to allocate these resources is a vital compute concern.
A limit creates a maximum ceiling for a resource allocation.
A reservation creates a guaranteed minimum resource allocation that the host must meet.
The concept of shares is used to arbitrate the issues associated with compute resource contention situations. Share values are used to prioritize compute resource access for all guests assigned a certain number of shares. Shares allow the cluster's reservations to be allocated and then addresses any remaining resources that may be available for use by members of the cluster through a prioritized percentage-based allocation mechanism.