1. In a processor of a data storage array, a method of obtaining configuration change information from host devices, the method comprising: receiving, at the data storage array, a set of change notices from a set of the host devices, each host device being constructed to perform data storage and retrieval input/output (I/O) operations on the data storage array over secure communications pathways of a communications fabric via a plurality of host bus adapters of that host device, each change notice being received by the processor of the data storage array when a respective host device of the set of host devices undergoes a configuration change; providing a set of requests from the processor of the data storage array to the set of host devices based on the set of change notices, the requests of the set of requests being sent only to a subset of the host devices which have undergone a configuration change during a most recent polling interval; and acquiring, at the data storage array, configuration change information from the set of host devices in response to the set of requests; wherein acquiring the configuration change information from the set of host devices in response to the set of requests includes obtaining logical unit number (LUN) mapping information from the set of host devices; wherein providing the set of requests includes periodically polling the subset of the host devices which have undergone a configuration change during the most recent polling interval, the host devices of the subset each being identified by a respective timestamp associated with a change notice of the set of change notices received during the most recent polling interval.