On Tue, 19 Feb 2008 12:32:37 -0600, Paul [EMAIL PROTECTED]
<[EMAIL PROTECTED]> wrote:

>Is it more likely that there's a level sensitivity, that the other
>system is entirely compaction-naive (how far down must that be?)

OS/390 2.5 introduced compaction for the SMPPTS.  IIRC there were 
PTFs to allow downleved SMP/E verions to expand that data also all the way
down to OS/390 V1.1.

Mark
--
Mark Zelden
Sr. Software and Systems Architect - z/OS Team Lead
Zurich North America / Farmers Insurance Group - ZFUS G-ITO
mailto:[EMAIL PROTECTED]
z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/
Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html

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