We have recently done something similar - Converting Informix zLinux to Postgres x86_64.
Short answer - We used unloads to put out csv files, wrote some python programs to cleanup data, then
imported them into our Postgres instance ...

Ben Duncan - Business Network Solutions, Inc. 336 Elton Road Jackson MS, 39212
"Never attribute to malice, that which can be adequately explained by stupidity"
- Hanlon's Razor


-------- Original Message --------
Subject: [GENERAL] Migrating data from DB2 zOS to PostgreSQL
From: Swapnil Vaze <swapvaze28@gmail.com>
Date: Mon, December 05, 2016 11:36 pm
To: pgsql-general@postgresql.org

Hello,

We need some help on how we can migrate data from DB2 zOS database to postgres database.

Are there any utilities present? Any thoughts how we should approach?

--
Thanks & Regards,
Swapnil Vaze