This read-only object reports the storage type, such as permanent or nonVolatile, of this VSAN-WWN row's configuration entry, and per the desc a row marked permanent need not allow write access to any of its columns at all. An admin reviewing configuration would use this to understand whether a given VSAN's WWN mapping can be modified or is a fixed, unmodifiable entry. For example, an admin trying and failing to change a wwnmVsanWwn value would check wwnmVsanWwnStorageType to see if that row is marked permanent and therefore intentionally locked.