create partition w/o losing data

We've made a mistake by creating file systems w/o partitions on an
/dev/emcpowerb device. You can't use growfs on non-partitioned
devices. Is there are a way to preserve the data (w/o copying back and
forth) but still preserving the data?

Thanks!
........
We run Oracle 9iR2,10gR1/2 on RH4/RH3
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