This object reports how many Logical Units exist on this target device but are not currently accessible via it, distinct from the accessible count in ciscoScsiTgtDevNumberOfLUs. An admin seeing this rise above zero on a device that previously showed zero should investigate why previously accessible LUNs became unreachable - possibilities include a path failure, a LUN masking change, or the array itself experiencing an internal fault affecting a subset of its LUNs. A device reporting 3 non-accessible LUs alongside a device status of abnormal would tie together as evidence of a partial array failure affecting only some of its logical units.