Hi!

 

I did such a downsizing a few years ago, CICS included.

 

But it didn't involve a daily 10 TB input or more.

 

Accordingly, I won't tackle the performance issue of a large amount of data to be crunched in and perhaps, spit out as well, though I have some ideas on the question.

 

However, as paradoxical as it may look, you could achieve a fully automated, more reliable production run under UNIX than under z/OS.

 

We actually performed an automated transform from IBM/TWS to CA/UNICENTER TNG with the same degree of automation.

 

We ended with a more reliable production just because, in the migration process, we debugged quite a few inner problems which had been remaining hidden by unsufficiently stringent condition code rules, among other issues.

 

Truly yours.

 

Gerard Joskowicz

 

00 352 621 371 952

 

 

----- Original Message ----
From: groteholger <groteholger@...>
To: os390andmvs@yahoogroups.com
Sent: Wednesday, June 4, 2008 12:02:11 PM
Subject: [OS390 and MVS] Downsizing large applications from z/OS to UNIX

I am looking for someone who has tried or/and achieved the downsizing
of a project from the mainframe to a UNIX platform.

The application specifics of our application are:
- BATCH-driven (Dialogs are insignificant), mainly COBOL (about 800
programs)
- 150 million input records to process per day
- 11 to 15 TB of customer data (which the input records "read")
- a BATCH window of 10 hours daily
- high usage of virtual storage/main storage/data spaces

At first glance this application does not look SUITABLE for
downsizing, but management sometimes has funny ideas.... 

If someone of you has experience with downsizing similar pplications,
here are my questions

- what degradation (if any) did you experience regarding THRUPUT?
- What experience did you make transforming your current scheduling
system to a unix based one? Do you need more intervention than
before? Can a fully automated system run fully automated on UNIX
boxes?
- how did you cope with high usage of virtual storage/RAM on your
UNIX boxes?

I would be grateful for any hint!



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