A bitmap which represents VSANs from 1 to 2048.
The discovered cache will be invalidated on those
VSANs for which the corresponding bits are set to
1 in this object. If the bit corresponding to a
particular VSAN is set to 1 and if the value of
fcsDiscoveryStatus for that VSAN is 'completed',
then the discovery cache on that VSAN will be
invalidated and the fcsDiscoveryStatus object for
that VSAN will be set to 'databaseInvalid'.