Complexities of Migrating Oracle 10g from Solaris to HP-UX Itanium

Can anyone share their experiences with regards to migrating Oracle 10g from Solaris on a Sun platform to HP-UX 11i v3 (Itanium) on HP Integrity servers. We are trying to consider all the risks associated with such a move. How much time delay did you experience in resolving unexpected issues along the way? How complex is the process? If you had to do it all over again, would you?
In addtion, we will also be migrating Oracle eBusiness Suite 11i (11.5.10.2).
We appreciate your helpful feedback.
Thank you.

Here is more information:
- the database size is currently about 500GB
- our ASP allows us to be down as much as we want however the company's own needs can only allow a downtime window of two days (over the weekend)
- i presume further that RMAN might be an option to use to backup the database and instance to some transportable media
- it would take about four days to get that media from the ASP to our facility so durign that time the instance at the ASP would have to be used
- after we get the backup media and load everything into our in-house site, our last step would be to find a way to migrate all changes over the WAN. I am told that unless the platforms are the same on both ends, mirroring will be extremely difficult or impossible. If we have a platform that is different from the ASP platform, then the migration of all changes will require conversion and other mechanisms. I am told that HP-UX has so much complexities that this will be a daunting task to accomplish.
Do you have any opinions and recommnedations?

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