Owners Manual

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 7. Shutdown threshold type
Threshold Temperature Exceeding Event Description
Nominal failure threshold A critical event is set
Maximum failure threshold Shutdown of the system power supplies occurs within 3
minutes
Shutdown threshold Shutdown of the system power supplies occurs within 5
seconds
System password reset
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.
If the controller firmware is before 08.20.09.60, then push and hold down the password reset switch for at least five seconds.
The password is deleted. You can change the password using MDSM.
If the controller firmware is 08.20.09.60 and later, then for more information about setting your password, see the Dell EMC
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.
Controller modules 15