Ignorance is a bliss sometimes, but once one becomes aware, one wants to know what it might be or how to react.
So, the RAID Web console is sending messages like these from time to time.
Controller ID: 0 Patrol Read aborted on PD: -:-:6
Generated On: Sat Mar 14 03:00:00 EET 2015
BIOS Version : 6.20.04.1_4.16.08.00_0x06090702
Firmware Package Version: 24.6.0-0036
Firmware Version : 4.260.00-4046
This might indicate that there might have been another background task running at the moment it attempted running the Patrol Read.
I would recommend checking the entire logs of the system to see what is being recorded before this event.