IBM Mainframe Discussion List <[email protected]> wrote on 10/08/2007 
12:29:36 PM:

> Once a frame has been assigned to a DREF area it is effectively the same
> as an ESQA frame (if it is in a common area subpool) or an ELSQA frame.
> ESQA is permanently mapped until it is freed or released. ELSQA is
> private storage, so in swappable address spaces it can be paged out and
> relocated across a swap cycle, but in practice it probably is
> indistinguishable from ESQA.

  Keep in mind that MVS is permitted to move a unfixed backed DREF
page to another real frame, so do not assume that the real address
of an unfixed backed DREF page will not change. 
 
Jim Mulder   z/OS System Test   IBM Corp.  Poughkeepsie,  NY

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