APC RAID Subsystem SCSI-SATA II Specifications Page 54

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Chapter 4 Subsystem Connection and Operation
Figure 4-2: Single Host Connection: Correct
Connection
Figure 4-3: Dual-Host Connection: Incorrect
Connection
A server is connected to one of the host ports.
There is no need for further termination
configuration because the firmware default is
“terminator ON,” and the auto-sense terminator is
also automatically enabled.
Figure 4-4: Dual Host Connection: Correct
Connection
The IN” and “OUT” ports are separately
connected to a server and a cascaded enclosure.
The auto-sense terminator is disabled, while the
firmware setting remains effective. Problems will
occur on the SCSI bus.
The IN” and “OUT” ports are separately
connected to a server and a cascaded enclosure.
The auto-sense terminator is automatically
disabled, and the firmware setting should be
manually
disabled.
The firmware default for SCSI bus termination setting is “ON.” The SCSI bus
termination setting can be manually enabled or disabled on each channel. See the
diagrams below for different accesses to the termination control. More details about the
SCSI Host Connection Prerequisites 4-3
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