Dell PowerVault MD3800i User Manual download pdf (Page 14)

Item Component Function

1 10 Gbps iSCSI IN port (2) Provides host-to-controller iSCSI 10 Gbps Ethernet

connection.

2 Seven segment display

sequence

Displays status or error codes for the storage array.

3 Controller power LED Lights green when controller power is on.

Turns off when controller is not powered.

4 Controller fault LED Lights amber when controller fault is detected.

Turns off when controller is operating normally.

5 System identification LED Blinks blue when system identification switch push-

button on enclosure front panel is pressed.

6 Cache active or cache offload

LED

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.

7 Battery fault Lights amber when battery backup unit or battery has

failed.

Turns off when battery backup unit is operating

normally.

8 Management port Provides a 100/1000 Mbps Ethernet connection for

out-of-band management of the enclosure.

9 Ethernet port (reserved) Reserved port.

10 SAS IN port (2) Provides host-to-controller SAS connection.

11 USB port This port is a reserved port.

12 Mini USB port Provides serial connection for debugging.

13 Password reset switch Activating this switch resets the password.

14 SAS OUT port (2) Provides SAS connection for cabling to an expansion

enclosure. It is recommended that you use port 0.

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 RAID Controller Module Backup Battery Unit .

NOTE: For virtual disks, the RAID controller firmware changes the data cache setting based on the

state of the battery. If the battery is missing or does not have sufficient charge, the controller flushes

the cache and sets the write cache attribute to Write Through for all virtual disks. When the battery

is replaced, Write Back is re-enabled.

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Dell PowerVault MD3800i User Manual Page 14