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The Rear Panel
Dual-Controller Models
Dual-Controller systems are indicated by an “R” in their model number (please refer
to Model Naming Conventions). 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.
EonStor GS 3012R / 3024RB
EonStor GS 3016R
The top controller (Controller A) is the primary controller. The bottom controller
(Controller B) is the secondary (= redundant) controller which is idle during normal
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 RAID system is rebooted, all system configurations will revert back to the
default state and Controller B returns the primary role to Controller A.
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