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Although Expandable Reservations are enabled by default on a resource pool, it doesn’t mean that they should stay enabled in every situation. In this white boarding session I’ll show what the hidden danger of using expandable reservations can lead to. The system considers the resources available in the selected resource pool and its direct parent resource pool. If the parent resource pool also has the Expandable Reservation option selected, it can borrow resources from its parent resource pool. Borrowing resources occurs recursively from the ancestors of the current resource pool as long as the Expandable Reservation option is selected. Leaving this option selected offers more flexibility, but, at the same time provides less protection. A child resource pool owner might reserve more resources than you anticipate.