Setting Up Redundant Controllers; Example Of Redundant Controllers - Acer AcerAltos 3102RS User Manual

Setting Up Redundant Controllers

Example of Redundant Controllers

Here is a sample illustration of the redundant controller's operation:
Primary
LD 0
Host
LD 1
LD 1
Secondary
LD 0
Normal Route
Redundant Route
The host computer is connected to both the primary and secondary
controllers. Each controller has one of its SCSI channels assigned as
the host channel, and the other SCSI channels assigned as the drive
channel.
The example below was done using firmware version 2.11. Later
versions of the firmware will also work perfectly well, but the message
displayed on the LCD may vary.
In firmware versions earlier than 2.11, only the
primary controller serves the host's I/O request while
the secondary controller just monitors the primary
controller continuously. In firmware version 2.11 or
later, both controllers can serve the host's I/O
request.
188
LD 0
LD 1
User's Guide