Dell MD3620F Cache Functions and Features, Storage Array Thermal Shutdown, System Password Reset

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. 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.

Table 3-2. 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 storage array password can be reset if it is forgotten. To reset the password, push and hold down the password reset switch for at least 5 seconds. The password is deleted. See Figure 3-1 to locate the password reset switch.

The RAID controller module allows you to change the password. For more about setting your password, see "Setting a Password" on page 75.

NOTE: The reset switch can be accessed by using a small object such as the tip of a pen.

Cache Functions and Features

Cache Mirroring

Cache mirroring function copies accepted host-write data from the primary controller to the partner controller. This action ensures that host-write data is safely mirrored to the partner controller before successful completion status is returned to the host. If a controller fails, the surviving controller safely retains all mirrored data. Cache mirroring is enabled by default.

Planning: RAID Controller Modules

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