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I don't understand what you mean by a concatenated volume. Are you referring to some underlying hardware RAID config?
I see a non-redudant ZFS storage pool of 2 LUNs so data is striped across each LUN.
There are several ways to improve the performance of an Oracle database:
1. Hardware RAID or a mirrored ZFS storage pool is recommended.
2. Which Solaris 10 release is this? The latest Solaris 10 release is recommended.
3. How many db file systems and how are they configured. A separate (small) pool for the redo log is also recommended.
You can read about these recommendations here: