Installing 9i 9.1.2.4 on the same Sun box as 8.1.0.2

we have a 500gbyte database running on 8.1.0,2 and we need to migrate to a new version (9.1.02) over a period of 2-3 months.
I just want to be sure that I have planned this correctly.
We will set up a new ORACLE_HOME and
a diiferently named database
will this be sufficient in order to allow both versions to run concurrently on the same SunFire box wile the migration goes on? We need to be able to install the the new version of Oracle, install a new databse, test the new database and then migrate the data.
For both versions, we need the user to be "oracle" in group "oracle".
many thanks in advance

We will set up a new ORACLE_HOME and
a diiferently named database
will this be sufficient in order to allow both
versions to run concurrently on the same SunFire box
wile the migration goes on? Yes, it'll be sufficient from a technical point of view. Maybe some performance problem ?
Paul
P.S. 9.1.2.4 - 8.1.0.2 : strange versions .....:-)

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