Each row in the table is in one of two states, invalid(1) or operational(2). If the state is invalid(1), the resilient pair represented by this row is not active. There are several reasons why this may be the case. Firstly during the row creation process, not all information necessary may have been provided. Secondly an operational pair may become invalid because the resilient pair rules are no longer met because of a change in the device configuration. If the parameters in the row are all valid then the pair becomes operational(2).