This CucsFabricSanConfigIssues field is a bitmask flagging specific configuration problems detected on this FC SAN cloud, such as a missing VSAN assignment or no member uplinks. For the fabric interconnect's switched Fibre Channel/FCoE uplink domain, i.e. the SAN traffic reaches once it leaves the fabric interconnect toward an upstream FC/FCoE switch, this lets UCS Manager tell an admin exactly which prerequisite is missing before this SAN cloud can actually pass storage traffic, rather than just reporting it as generically 'down'. A value of zero means this SAN cloud is configured cleanly; a non-zero value would decode to one or more specific missing-prerequisite flags an admin needs to fix before uplinks here will come online.