How can I extend the historic performance data in the monitoring console?

[afx]

Hi,
I am running a small cluster (2*I, 1SH, 1DS) and when I use the monitorig console on the deployment server it happily shows me indexing information for 60 days.
But I only see 8 days of CPU/memory data for the boxes.

What do I need to adjust to get a longer history span for the ressource usage?
An while I am at it, also for the performance....

thx
afx