Compaq Infortrend manual Fibre-Based Controllers, Redundant Controller 10-3

The physical connection between redundant controllers should be similar to the one shown above. The basic configuration rules are:

1.All channels should be connected to both controllers as diagrammed above or strung across via a common backplane. Disk drives are connected to both controllers.

2.Cached writes are constantly duplicated in both controllers’ memory over a dedicated SCSI channel. The default path for controller communications (SCSI-based controllers) is channel 0.

Channel 0 is also the default for host interface; therefore, avail other channel(s) for host connection by changing its channel mode. See Chapter 7 for details about channel mode configuration.

3.SCSI channels should be terminated on both ends. It is recommended to use the termination jumpers on the SCSI-based controllers to configure the termination setting. Terminators are provided on controller back-end PCBs. This design allows the controller to be removed during the controller failover process.

Fibre-Based Controllers

Connection between controllers is more flexible with the Fibre-based controllers.

Figure 10 - 2 Dual-Controller Configuration Using Fibre- Based Controllers

Redundant Controller 10-3