For block-based storage, the different logical disks are provided to the ESXi storage subsystem with a unique logical unit number (LUN) identifier.
If you are adding new LUNs (or modifying the LUNs geometry), then you might need to rescan your storage to see the changes at the ESXi level. There are two different types of storage rescan: automatic and manual.
Automatic rescan is performed directly by the vCenter Server on all the hosts in the same cluster. This feature can be turned off with a specific vCenter advanced option: Config.vpxd.filter.hostRescanFilter.
By default, when you perform ...