Compaq Infortrend Manuale Utente

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.

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