A storage system maintains a journal of journal entries and at least one snapshot of one or more data volumes. The storage subsystem manages a storage extent by a group unit and creates storage extent configuration information. A determination is made whether the measured target parking space is sufficient to allow an autonomous parallel parking maneuver. , to inhibit proliferative conditions, such as cancer and psoriasis. The assay is particularly useful for testing material treated with pyrethroids, such as bed netting and the like. Second light receiving element receives light beam emitted in Second direction.