Oracle Migration 7.3.4.5 to 8.1.6.3

[Mark Cilia]

Hi All   We are in the process of migrating our database from 7.3.4.5 to 8.1.6.3. We are using a Sun Cluster (2 E4000 each with 4x480Mhx processors and 4gb Ram) for our system which is almost 24x7. This whole operation must be performed (ideally) within a maximum of 24 hour period (during say a national holdiday). Our database is approx 100Gb large.   Any suggestions on how to do this operation? Any past experience?   TIA mark