This object identifies the source logic volume of the mirror.
The object identified by this index is the same object as identified
by the same value of hh3cLvindex.
Note that an entry of hh3cMirrorConfigTable can be created only when
the associated hh3cMirrorDistributeTable's objects is ready or the associated
select policy is not equal to 'none'.
If an entry is deleted, the associated hh3cMirrorDistributeTable
objects should be deleted automatically.