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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.
Table 1. Shutdown Threshold Type
Threshold Temperature Exceeding
Nominal failure threshold
Maximum failure threshold
Shutdown threshold
System Password Reset
To reset the password, push and hold down the password reset switch for at least five seconds. The
password is deleted. You can change the password using MD Storage Manager.
For more information about setting your password, see the Dell PowerVault MD Series Storage Arrays
Administrator's Guide at dell.com/powervaultmanuals.
NOTE: If your system is iSCSI based, you can use the Modular Disk Configuration Utility to reset
the system password.
NOTE: The reset switch can be accessed by using a small object such as the tip of a pen.
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Event Description
A critical event is set
Shutdown of the system power supplies occurs
within 3 minutes
Shutdown of the system power supplies occurs
within 5 seconds
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Troubleshooting
