APC RAID Subsystem SCSI-SATA II - Manual (Page 22)

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1. The system buzzer alarms 1 second when system boots up
successfully.
2. The system buzzer alarms continuously when there is error level event
happened. The alarm will be stopped after mute.
3. The alarm will be muted automatically when the error situation is
resolved. E.g., when RAID 5 is degraded and alarm rings immediately,
after user changes/adds one physical disk for rebuilding, and when the
rebuilding is done, the alarm will be muted automatically.