EonStor / EonStor DS S12/S16/S24 Series
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The Rear Panel
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Dual Controller Models
Dual controller systems are indicated by an “R” in their model number (please refer
). Controller A is located on top and controller B at the
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.
Be sure every PSU shou ld
have t he sa me mark
3Y
405W
Be sure eve ry PSU should
h ave t he same mark
3Y
405W
Be sure every PSU should
have t he same mark
3Y
405W
C H0
C H1
C H0
C H1
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.
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