Index cache foot print overview

Hi,

We have a grid where the index drives have utilization. The grid has 10+ storage policies with servers running OS backup.

I would like to try and define a process where we move 1 or more storage policy to another grid to stop the index cache growth.

Is there an overview somewhere (maybe report) that give give info about the actual index cache footprint for each storage policy?

Because then I hope we would be able to look at the different index cache sizes of the storage policies and then based on that decide which storage policy we need to move to another grid.

Thanks.