Dell MD3200i, MD3220i RAID Controller ModuleAdditional Features

34 Planning: RAID Controller Modules

RAID Controller Module—Additional Features

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" on page 210.

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.

The system automatically shuts down when system temperature exceeds the

safe threshold. The battery backup unit protects against data loss by

providing power to offload to non-volatile memory in the event of power loss.

It is not necessary to shut down any MD1200 Series expansion enclosures

attached to the storage array when thermal shutdown occurs.

Temperature threshold values determine the temperature at which shutdown

occurs. These thresholds cannot be changed.

18 Management port

speed LED

Lights green when ethernet connection is operating at

1000 Mbps.

Lights amber when ethernet connection is operating

at 100 Mbps.

Off when ethernet connection is operating at 10 Mbps

or is not active.

19 Management port

activity LED

Lights green when ethernet connection is active.

Off when ethernet connection is not active.

Item Component Function

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