A system for determining a quota comprises an input interface and a processor. The input interface is configured to receive an input quota value. The processor is configured to: determining total reservations for shared balances; determining whether the total reservations exceed ideal value maximum shared reservation amount; and in the event that the total reservations do not exceed an ideal value maximum shared reservation amount: indicating no modification to input quota value; setting output quota value to input quota value; and providing the output quota value.