How to stop a linux server from beeping when a RAID HDD has failed
Solution 1:
Go to LSI's website and download the CLI tool for your RAID card. Depending on the driver you're using (the one from LSI or the default one in the kernel) you can do just about anything, including turning off the alarm.
MegaCli -AdpSetProp AlarmSilence -a0
or MegaCli -AdpSetProp AlarmSilence -a1 (depending on which slot is installed)