-2. The master engine on the MDT scans the MDT local device. Each object is
-checked for the consistency criteria enumerated in the 'features' section of
-this document.
+2. The master engine on the MDS scans the MDT device using namespace iteration
+(described below). For each striped file, it calls the registered LFSCK process
+handlers to perform the relevant system consistency checks/repairs, which are
+enumerated in the 'features' section. All objects on OSTs that are never
+referenced during this scan (because, for example, they are orphans) are
+recorded in an OST orphan object index on each OST.