Actually we can do a lot more than one would think.
First, we would need to find which specific initiators are mapped to the LUN, and then find who holds any persistent reservation. Since this is FCP we are dealing with here and not iSCSI, the reservation key is simply the WWNN of the HBA on the host holding the reservation.The ZAPI lun-initiator-list-map-info gives us information about which initiators are mapped to the LUN, and lun-get-persistent-reservation-info tells us who holds the reservation. Using the Data ONTAP Powershell Toolkit, we first find out which initators are mapped to our LUN. To all the mappings by LUN: