User’s Guide
188
Setting Up Redundant Controllers
Example of Redundant Controllers
Here is a sample illustration of the redundant controller’s operation:
Secondary
Primary
Host
LD 0
LD 1
LD 0
LD 1
LD 1
LD 0
LD 0
LD 0
LD 1
LD 1
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.
Summary of Contents for AcerAltos 3102RS
Page 1: ...AcerAltos 3102RS AcerAltos 3102RS Ultra SCSI to Ultra SCSI RAID Controller User s Guide ...
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Page 55: ...Chapter 3 Functional Descriptions 37 Drive E now has a capacity just under 1800MB ...
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