The buzzer keeps alarming in some cloud storage node of T3500, but the indicator is not lighted. It may be the hardware failures.
Change the disk in fault.
A RAID group works in degradation through checking the log. It is found that the state of a disk is failed which makes all the RAID group work in Degradation through collecting the information of the RAID group by CLI tool of Areca RAID. But owing to the older FW version of RAID, the indicator will not flash to alarm.