Fast Cache and Storage Pools

Hello everybody

I've got a system with two storage pools (one pool 15K disks SAS and one NL-SAS). On the Fast Pool there are many LUNs which provides server from different type with capacity.

On one of those LUNs there is an DB Server which the customer complains about lack of performance. I check the LUN and the pool and i saw that there is Fast Cache enable for this pool but no Fast VP because all the disks in the pool are from the same type.

How can i check if the Database server blocks are pushed by the Fast Cache Disks? Is there any way to check this?

In generel what would be you design in such a situation?

1) created different pools with different disk type and activate fast cache on a dedicated one OR

2) Create a big one with different disk type and activate Fast VPn

How do you check then if the right blocks are pushed by the fast cache?

How do you messure the different beteween non fast cache LUN and fast cache LUN when there is a Fast Cache funtion on a whole pool? I would like to know the difference by a system when it runs with and without fast cache.

But in this user scenerio I think it is not pissble to quantify...

Thanks