NEC EXPRESS5800 User Manual page 57

If Enable Buzzer is checked in controller setting, the
buzzer rings with the logical drive being in the critical
or offline state or rebuilt. To turn on/off the buzzer,
check or uncheck the checkbox of Enable Buzzer in
the Controller Settings tab. See the description of the
Buzzer tab in "3.5.2 Controller" for details. Buzzer
ringing is automatically stopped when the logical
drive is recovered to the normal state.
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