This object represents a Real Device(s) identifier
that this Virtual Device virtualizes.
A Real Device element represented by the combination
of value of this object preceded by the value of
corresponding instance of cFcSdvVirtRealDeviceIdType
should be unique for a Virtual Device within a VSAN.
When the value of the corresponding instance of
cFcSdvVirtRealDeviceIdType is 'singleDevDevAlias',
the value of this object is the name of a Device
Alias pointing to a specific entry identified by
the instance identifier value of
'cfdaConfigDeviceAlias' of cfdaConfigTable in
the CISCO-FC-DEVICE-ALIAS-MIB.