Item

Indicator, Button, or

Icon

Description

 

Connector

 

 

 

 

 

 

5

SAS OUT port

 

Provides SAS connection for cabling to a downchain

 

 

 

expansion enclosure.

6

Diagnostic LED

 

The numeric display consists of two seven-segment LEDs

 

 

 

that provide information about enclosure identification

 

 

 

and diagnostics.

7Controller power indicator

8Service action required indicator (system)

9Service action allowed indicator

The controller power indicator lights green when controller power is on.

The service action required indicator lights amber when there is a fault in one of the components in the system.

CAUTION: Remove the expansion module from the system only if the service action allowed indicator lights blue. Removing the expansion module from the system when the service action allowed indicator is off may damage the system.

Blue

Indicates that you can safely

 

remove the expansion module

 

from the system.

Off

Indicates that you cannot remove

 

the expansion module from the

 

system.

RAID Controller Module—Additional Features

Battery Backup Unit

Each RAID controller module 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.

NOTE: For virtual disks, the 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.

Storage Array Thermal Shutdown

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

Temperature threshold values determine the temperature at which shutdown occurs. These thresholds cannot be changed.

NOTE: It is not necessary to shut down any expansion enclosures attached to the storage array when thermal shutdown occurs.

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Dell E08J Series RAID Controller Module-Additional Features, Storage Array Thermal Shutdown, Battery Backup Unit