Raid Controller Module-Additional Features; Battery Backup Unit - Dell EMC PowerVault MD3820i Owner's Manual

Table 4. RAID Controller Module Connectors And Features (continued)
Item Component
2 Seven segment display sequence
3 Controller power LED
4 Controller fault LED
5 System identification LED
6 Cache active or cache offload LED
7 Battery fault
8 Management port
9 Ethernet port (reserved)
10 SAS IN port (2)
11 USB port
12 Mini USB port
13 Password reset switch
14 SAS OUT port (2)
RAID Controller Module—Additional Features

Battery Backup Unit

Each RAID controller contains a two-cell Lithium ion nanopolymer battery backup unit (BBU). It provides power to the RAID
controller module in the event of a power outage. For information on removing and installing the BBU, see
Module Backup Battery Unit
12 Controller Modules
.
Function
Displays status or error codes for the storage array.
Lights green when controller power is on.
Turns off when controller is not powered.
Lights amber when controller fault is detected.
Turns off when controller is operating normally.
Blinks blue when system identification switch push-button on
enclosure front panel is pressed.
Lights green when on-board controller memory contains data.
If AC power fails, this LED changes to indicate Cache Offload
status. If the password reset function has successfully changed
the password, this LED flashes on and off briefly.
NOTE: The password reset switch is not available if your
system was shipped after September, 2015. The password
reset switch functionality was disabled starting from
controller firmware 08.20.09.60 and later versions.
Lights amber when battery backup unit or battery has failed.
Turns off when battery backup unit is operating normally.
Provides a 100/1000 Mbps Ethernet connection for out-of-band
management of the enclosure.
Reserved port.
Provides host-to-controller SAS connection.
This port is a reserved port.
Provides serial connection for debugging.
Activating this switch resets the password.
NOTE: The password reset switch is not available if your
system was shipped after September, 2015. The password
reset switch functionality was disabled starting from
controller firmware 08.20.09.60 and later versions.
Provides SAS connection for cabling to an expansion enclosure.
It is recommended that you use port 0.
RAID Controller