I do not have benchmark result on ASM vs volume manager.
But my question is :
why does oracle want to enter into a new segment i.e RAID LEVEL?

ASM has both mirroring and striping features to provide a robust (??) file system. It spreads the database objects (object extents) over multiple devices on a round robin basis.

Basically it tries to eliminate 3rd party logical volume manager.
Why ?
Does oracle want to take over Veritas?

Tamil