Hi Guys

In our shop we have 2TB of data stored on a SAN, originally it was one
huge volume. That yielded really poor performance.

So we had our SAN guys (after lots of denial from them) partition up
the SAN into 10 different Volumes, we then partitioned our biggest
table ( > 1TB ) across these 10 volumes, and performance was a lot
better. Maybe you should look into (if you haven't already) Table/
Index partitioning, we've had massive improvements by implementing it.

Good Luck,

Alex