Fusion Drive - HDD spins up often

Hi,
I am currently using Fusion Drive and all seems to be working fine.
The only thing I could remark on at the moment is that the HDD is being turned on and off very often by Fusion Drive. Sometimes, it even stalls the computer, until the HDD is fully spun-up. I'm a little worried that all the start / stop cycles will eventually weaken and damage the HDD.
The question is: can Fusion Drive be tweaked (terminal ?) ?
The configuration is
1x 128 GB OWC Mercury EXTREME Pro 6G SSD:
1x 500 Gb Western Digital Blue drive
Thank's all.

From the menu bar, select
 ▹ System Preferences ▹ Energy Saver ▹ Power Adapter
and uncheck the box labeled Put the hard disk(s) to sleep when possible, if it's checked.

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