Fujitsu IRF-1S series User Manual page 87

Duplex Mode (imageRAID IRF-2Sxx-xx/IRF-2Dxx-xx)
The basic duplex operating mode provides a single enclosure with dual RAID
Controllers. The two controllers operate in an active-active configuration, where
both controllers are actively processing data. This greatly improves the overall
system performance and provides the most robust system redundancy.
The supported operating mode is Multi-Port Mirrored, where all controller ports
are active and connected to individual fibre loops. It provides transparent
hardware failover and failback. During a controller failure, internal HUB circuitry
located on the Host I/O cards automatically connects the incoming Fibre loops
together and the surviving controller immediately starts processing host
commands.
This duplex mode supports several cabling configurations. The configurations
demonstrate attachments to a single enclosure and multiple enclosures.
CAUTION: The bus speed must be set to the same setting between the disk
drives and the Disk I/O card(s), and the host system HBAs (BIOS
setting) and the Host I/O cards. For example, if you are using 2 Gb
drives, the Disk I/O cards must be set to 2 Gb mode. If your host
system HBA(s) is set to 1 Gb mode, the Host I/O card(s) must be set
to 1 Gb mode.
NOTE: Split-bus mode is not supported when a RAID Controller is installed.
Multi-Port Mirrored Single Host-Single Connection Configuration
1
Set the jumper (JP4) on the Disk I/O card to configure the bus speed mode.
Loosen the two captive fastener screws for the Disk I/O card and pull it from
the enclosure using the fastener screws. Locate the jumper JP4 and position it
for the desired speed setting, (installed on one pin only for 2 Gb mode and
on both pins for 1 Gb mode).
Chapter 3 - Setup and Installation
Duplex Mode (imageRAID IRF-2Sxx-xx/IRF-2Dxx-xx)
75