This reports the FC zone sharing mode configured for this VSAN - roughly, whether zone configuration is treated as VSAN-specific or shared across the fabric. This affects whether zoning changes made under one VSAN inadvertently apply to devices under another VSAN sharing the same fabric, so an admin managing multiple isolated storage tenants on shared hardware checks this to confirm zoning is properly scoped per-VSAN rather than shared. A VSAN configured with a non-shared, VSAN-specific zoning mode would keep its zone database completely separate from a sibling VSAN's zones even on the same physical switch.