11
Power supply unit with built-in cooling module
Cooling module is built into the power supply unit (PSU) to protect the system from
overheating. The two hot-swappable PSUs provide constant power to the system. The
modular nature of the system and the easy accessibility to all major components ensure ease
of maintenance.
The Rear Panel
Dual Controller Models
In Dual Controller systems, Controller A is located on top and controller B at the bottom for
all models. If one controller fails, the second controller module will take over in a manner
that is transparent to application servers.
2U models
3U models
The top controller (Controller A) is the primary controller. The bottom controller (Controller
B) is the secondary (= redundant) controller which is idle during norm al operation and
takes over the management role when Controller A cannot function properly due to
hardware error, controller module removal, etc.
If the failed Controller A restarts or a replacement is installed, Controller A will temporarily
assume the role of the secondary controller.
When the Unified Storage system is rebooted, all system configurations will revert back to
the default state and Controller B returns the primary role to Controller A.
