I own a Drobo and I found that when connected to my Macbook the Drobo Dashboard would sometimes use up over 90% of the CPU and cause the fan to stay on indefinitely. The only solution was to close the program (Dashboard) that monitors the connected Drobo. The latest Dashboard and firmware for the Drobo fixes this mysterious problem.

Drobo Firmware and Drobo Dashboard 1.0.2 Release Notes

And now you can get a Drobo at a reduced price:
August sees the Drobo discount increased to $50. The discount goes back to $25 after August 31, so hurry. Go to the Drobo Store and use the coupon code EVJASONS