DBAs:

Can anyone of you share info about how to convert from Sun Oracle to Linux Oracle on 9i database. We have a DWH system about 200 GB that needs to be converted. We have all our oracle on SUN or creating new environments on Linux, but we want to convert now.

Export Import does not work for us since the database is used in the morning and nights we populate with feeds

RMAN does not work (Sun to Linux)

Cold Bkup does not work (Sun to Linux)

So, what are other solutions?
Any experiences or documentation or links

Thanks, ST2003