At 22:05 -0600 on 11/17/2015, Joel C. Ewing wrote about Re: Fastest
way to read OLDEST GDG entry:
After several decades of using MVS I finally ran into a case where I
thought GDS/GDG versioning might be useful and used it to create a
corrected version of a GDS generation using V01 to make it obvious it
was a corrected version.
It is also useful when you want/need to move the file to another
device type. I had a case, years ago, when we wanted to move from
tape reel media to cartridges and the files needed to be kept for a
significant period of time (past when we wanted to retire the tape
reel device. By copying the Tape Reel V00 to a Cartridge as V01 we
had the file remain as a GDG in its proper relative number.
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