Infortrend10-13
Figure 10 - 10 Controller Failover
E. Controller Failure
Controller failure is managed by the surviving controller. The
surviving controller disables and disconnects from its counterpart
while gaining access to all signal paths. The existing controller then
proceeds with the ensuing event notifications and take-over process.
The existing controller is always the Primary controller regardless of
its original status and any replacement combined afterwards will
assume the role of the Secondary.
Symptoms
!
LCD on the failed controller is off. LCD on the surviving controller
displays controller failure message.
!
The surviving controller sounds alarm
!
The "ATTEN" LED flashing on the existing controller
!
The surviving controller sends event messages notifying controller
failure
Connection:
The channels of the two controllers that are connected together must
be the same. For example, if controller A uses channel 2 to connect a
group of drives, controller B must also use channel 2 to connect to the
same group of drives.
