Galaxy Raid GHDX4 SAS<>SAS / SATA 12Bay Installation / Hardware Reference Manual
1.4.2 Components
The following components are hot-swappable:
1.4.3 Normalized Airflow
Proper cooling is referred to as "normalized" airflow. Normalized
airflow ensures the sufficient cooling within the system and is only
attained when all components are properly installed. Therefore, a
failed component should only be removed when a replacement is
available. If a failed component is removed but not replaced, airflow
will be disrupted and damage to the system can result.
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Power supply units (PSUs)
Cooling modules
Hard disk drives