12-20-2010
Well, if you can afford it - you may standup a standby (Oracle-Standby) database and decide a date and shutdown the real DB and convert the new database as the production. If you plan it well, you might be done with an Hour downtime. In the worst case, backout is to shutdown the new database and startup the old. ( 5 mins ? ). I am sure change management is going to like this one. Very similar to the hot backup solution someone posted.
If all you want is to move to new disks, the storage vendor might have some utilities as well. BCV for local copies and SRDF for copy across arrays in the EMC world. (I assumed you have SAN storage)
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