This read-create FcList is a bitmap where each set bit identifies, via zoneIndex in the zoneTable, a zone that is a member of this zone set on this VSAN, with a default value of the zero-length string (no zones). Admins use it to define exactly which zones are grouped together under a given zone set. For example, an admin assembling a new zone set for a set of storage arrays and hosts would set the bits in this list corresponding to each relevant zone's index.