Moving MIM sharepoint database

Hi,

I can't seem to find much on google but I'm wondering what steps are involved in moving FIM's sharepoint databases to a completely different SQL server? are there specific registry keys that need to be changed or anything like that?

Cheers.

edit: when accessing the portal we receive a "UnwillingtoPerformException: IdentityIsNotFound" in the event log and directly before that another error:

GetCurrentUserFromSecurityIdentifier: No such user NT AUTHORITY\IUSR, S-1-5-17