The Rear Panel; Dual Controller Models - Infortrend S12 Series Hardware Manual

The Rear Panel

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Dual Controller Models

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Dual controller systems are indicated by an "R" in their model number (please refer
to Model Naming
bottom for dual controller models. In dual controller configuration, 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 which manages the entire
RAID system in normal operations. 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.
EonStor / EonStor DS S12/S16/S24 Series
Conventions). Controller A is located on top and controller B at the
C H0 C H1
C H0 C H1
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