This is from "z/OS V1R9.0 DFSMShsm Storage Administration Guide"  (SC35-
0421-06) page 65.  (Other releases may have changed the manual 
name/number and/or page.)  This discussion is for tape mount management 
datasets ... the description of such is not that clear; but, it really means 
direct to ML2 migration(s).  These behave differently.  Note "Trigger 
Threshold" description here.  This may (or may not) explain what you are 
seeing and why.

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