Metaset repartitioning

Dear all,
This metaset stuff drive me crazy.
The story begin with the Solaris 8 upgrade....
We have a pair of Solaris 8 with Sun Cluster 3.1, to prevent a long downtime, the Live Upgrade was chosen. As metadb cannot use LU to upgrade directly, we remove the diskset before upgrade, and put it back to a new diskset after upgrade.
here comes a nightmare, as SDS using a small slice while SVM needs a bigger one, so guess what.....REPARTITION...take place.
I am talking about 3TB of database, so, it will take days to restore the data back, not even a weekend can finish, still thinking what to do.

Any advice is really apreciated!!

Thanks and Regards,
Donald