A physical reservation is a set of physical machines reserved for and available to a particular business group for provisioning.
Any physical machine or blade represented by a physical endpoint is available to any fabric administrator to include in a physical reservation, but each machine or blade can belong to only one reservation. Unprovisioned physical machines or blades must be added to a physical reservation before they can be provisioned or imported, and cannot be removed from a reservation until they are decommissioned and become unprovisioned. Each physical reservation is for one business group only but a business group can have any number of physical reservations containing any number of physical machines or blades.
A reservation can also define policies, priorities, and quotas that determine machine placement.