Misi,

The last time I installed the tool, DDM had seperate folder structures with
the instructions, mapping files, etc per version.

When you run DDM, you select the "from-to" servers and the tool fetches the
server versions - that's how it knows which mappings to use.

Link to the docs:
https://docs.bmc.com/docs/display/public/itsm81/Performing+the+data+migration
​
I have used DDM strictly as a bulk data pump (which it was *not* designed
for) and it is *aggravatingly* slow. Speed varies based on robustness of
the environment and per record data sizes (ie attachments in worklogs,
etc), but I was getting about 100 records every 8 to 16 or so seconds.
Pretty awful. I was only moving less than 200k records, so it was tolerable.

However, the benefit is that the tool handles cross version mappings and
worked spot on accurately - even for custom forms & fields.

Hope this helps!
-JDHood

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