>A majority of our disk data sets that were not in use were deleted as a result.

We had a similar situation.
The datasets were backed up, but we didn't have HSM, FDR, ASM2, or anything 
like that.

A non-programmer storage analyst (and I use the term loosely), had written an 
EZYTREV programme to look at VTOC listings and generate delete statements based 
on the age of datasets (since last accessed).
It didn't handle the new year well (circA 1984), and on January 2nd, everything 
went bye-bye.

We restored on an on-demand basis, and production eventually completed.
Developers were very ticked off!

He went to the director to appologoise, hoping to keep his job.

It turns out the director was overjoyed.
We were using a service bureau, and the monthly bill was 30% of what it had 
normally been.
A lot of the data never made it back to disk.

-
Too busy driving to stop for gas!

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