D OMVS,F output on the file system server (owner) system
indicates that the file system is in a NORMAL UNMOUNT (or equivalent
UNMOUNT) state.
MODIFY BPXOINIT, FILESYS=DISPLAY,GLOBAL output lists the
file system server system in the SYSTEMS PERFORMING UNMOUNT serialization
category, and the MODIFY command indicates no other categories of
serialization. If the MODIFY command does indicate other serialization
categories, see Scenario 4: Mount, unmount, or quiesce processing seems to be delayed.