The Rear Panel; Dual-Controller Models - Infortrend EonStor GS 3000 Series Hardware Manual

The Rear Panel

Dual-Controller Models

Dual-Controller systems are indicated by an "R" in their model number (please refer
to Model Naming
bottom for all models. If one controller fails, the second controller module will take
over in a manner that is transparent to application servers.
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.
Conventions). Controller A is located on top and controller B at the
A
EonStor GS 3012R / 3024RB
A
EonStor GS 3016R
18
B
B