IBM Mainframe Discussion List <IBM-MAIN@BAMA.UA.EDU> wrote on 01/26/2006 
08:26:10 PM:

> When Expanded Storage was introduced on the 390-200 the way VIO worked 
was
> changed. VIO was written to ES and not the page datasets, which meant 
that
> unless you had really saturated your ES and pushed the migration age 
down,
> VIO rarely went any where near a real disk. In a real sense it became a 
RAM-
> drive.

A minor correction to the timeline...

  Expanded Storage was introduced in SP2.1.3 for the 3090-200.  VIO was
not written to ES at this time.  VIO to ES was introduced a few years
later as an SPE (OY08836).
 
Jim Mulder   z/OS System Test   IBM Corp.  Poughkeepsie,  NY

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