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Please see the following link for the default ports for JDBC to iSeries:
http://www-03.ibm.com/systems/i/software/toolbox/faqports.html
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You can also check with "NETSTAT" on the iSeries if the ports are open.
JDBC driver versions
Please see the comments on IBM DB2.
EBCDIC Encoding
One of our partners came across a special issue with an AS/400 (a.k.a. iSeries a.k.a IBM System i) returning data in EBCDIC encoding to Pentaho Data Integration.
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Option: translate binary Value : true |
This solved the issue.
Zoned or Packed Fields
The IBM Toolbox for Java JDBC properties list the property "big decimal". When set to "true" it returns a Kettle data type of a BigNumber instead of a Number that could help in specific cases. It is recommended to set this option to "true" due to possible rounding issues with Numbers (double precision values), but has a small performance impact.
Monitoring
Have a look at the QZDASOINIT jobs at the AS/400. These jobs are serving the database SQL server jobs for JDBC and looking into these give a lot of extra information.