The MegaRAID controller will automatically detect if a disk has errors causing the RAID volume to be degraded. An error message will appear on the desktop of that system.
The system will also generate a beeping sound indicating it needs attention:
This article provides the steps to determine and replace your defective HDD in DIVAR IP R2
This article also applies when:
On the front Panel the Red LED at the HDD is on
The HDD is shown as faulty in the MegaRaid Software
Mega RAID Storage Manager