On Tue, 14 Jul 2009 09:00:38 EDT, Gene Hudders <[email protected]> wrote:

> Depending on where you are software wise, you may not be able to  back
>level your software to run on z800 and even if you can, there may be a
>conversion and risks associated with the conversion. 

Huh?  If his software supports z9, then he certainly can support older z
hardware,
including z800.    The problems would only be if he is using new features that
were z990/z890 or z9EC/z9BC that he could no longer use and would have to
plan for not using them.  There is a long list - more LPARs, more CHPIDs,
more than one LCSS (Logical Channel Subsystems), more internal LANs for 
HiperSockets, MSS (Multiple Subchannel Sets), just to name a few. But being
a small shop none of those may be a factor. 

FICON and (less likely) OSA speed could be an issue depending on what
he has today on the z9.

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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