Compaq Infortrend manual E. Controller Failure, 10 Controller Failover, Symptoms, Connection

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.

10-13 Infortrend