Another way to look at is by evaluating:
1) your software inventory - what is installed on the host and what is
really used
some applications might run on a smaller machine (something like a
LinuxOne)
2) talk to your IBM sales rep (enterprise software)
3) consider different scenarios:
- one without any mainframe (but you need to come up with a
complete calculation - including the migration/reprogramming effort,
higher sysadmin costs (more servers=> more people), higher power
consumption, more points of failure,...
- one with a mixed operation: i.e. mainframe + (some) intel servers
- complete consolidation of ALL/MOST servers to the mainframe
There is a lot literature on that - especially IBM redbooks.
http://www.redbooks.ibm.com/redpapers/pdfs/redp0222.pdf
https://de.scribd.com/document/249244362/S-390-Server-Consolidation-A-Guide-for-IT-Managers
But any sound decision should be based on a business case.
Most offloading proposals ignore large parts of the operation - running
a PL/I or COBOL program on a PC is easy,
to run your complete business on a PC is completely different story.
Mike
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