This object identifies the source of the data for
which historical data was collected and
placed in a media-specific table on behalf of this
snL4RealServerHistoryControlEntry.This source can be any
real/virtual server and real/virtual server port on
this ServerIron. In order to identify
a particular instance, this object shall identify
the instance of the object, defined in the above
statistics tables.
This object may not be modified if the associated
snL4RealServerHistoryControlStatus object is equal to valid(1).