IBM HSM products have always supported unprivileged, user triggered recall 
of any file.  I am not familiar with any particular GUI, but from the CLI, 
it's easy enough:

dd if=/pathtothefileyouwantrecalled  of=/dev/null bs=1M count=2  &  # 
pulling the first few blocks will trigger a complete recall if the file 
happens to be on HSM

We also had IBM HSM for mainframe MVS, years and years ago, which is now 
called DFHSM for  z/OS.   (I remember using this from TSO...)

If the file has been migrated to a tape archive, accessing the file will 
trigger a tape mount which can take a while, depending on how fast your 
tape mounting (robot?), operates and what other requests may be queued 
ahead of yours....!



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