321 Studios GHDX2-2430S-24F4D manual Cooling Modules, Intelligent Dual Speed Operation

Galaxy GHDX2-2430S/R-24F4D Installation and Hardware Reference Manual

	1.	Warning messages are issued.
	2.	The subsystem is temporarily held in an idle state.
	3.	The firmware forces the subsystem to stop serving host
2		I/O requests.
	4.	After the failed PSUs are replaced, array administrators
		should manually turn the power switch off and then on.
	5.	If the subsystem is powered on with only one PSU, the
		firmware will start the initialization process but stays idle
		until at least one other PSU is added.

Table 1-1: Power Supply Safety Restrictions

1.2.8Cooling Modules

These Galaxy 24 bay subsystems come with two (2) hot swappable, redundant, dual-fan cooling modules. Two (2) 8cm blowers are housed in each cooling module and provide ventilation airflow from the front to the rear of the subsystem, extracting the heat generated by the SATA hard drives and other components.

Intelligent Dual Speed Operation

The fans in the cooling module operate with two rotation speeds. Under normal operating conditions, the cooling fans run at the low speed, which is sufficient for maintaining an efficient airflow across components. Under the following conditions, the cooling fans automatically increase their rotation speed to increase the airflow:

1.Component Failure: if a cooling fan, PSU, or temperature sensor fails, the remaining cooling fan(s) automatically raises its rotation speed.

2.Elevated Temperature: if the temperature breaches the upper threshold set for any of the interior temperature sensors, the cooling fans automatically raise its rotation speed.

3.During the initialization stage, the cooling fans operate at the high speed and return to low speed once the initialization process is completed and no erroneous condition is detected.

1-12 Introduction