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Installing the A5150A Adapter
SCSI Bus Termination
Chapter 232
Scenario One
If peripheral devices are connected to the external connector and the
HBA is at the end of the SCSI bus, you must terminate the last device on
the bus. Termination is also required on the HBA. If you have not
disabled the auto termination feature of the HBA as described in “How to
Turn Off Auto Termination” on page 33, termination is automatically
applied on the HBA.
Scenario Two
If peripheral devices are connected to the external connector, and you
have disabled the auto termination feature of the HBA by moving the
jumpers to the position that shorts both pins of the pin sets together, you
must put a separate terminator on the HBA. You can do this by
connecting a terminator to the unused internal connector of the HBA, or
by connecting an inline-terminated cable to the HBA.
NOTE This is true only if the HBA is at the end of the SCSI bus, and not in the
middle of the bus in a High Availability or multi-initiator configuration.
Scenario Three
If no devices are connected to the external connector and you have
disabled auto termination as described in “How to Turn Off Auto
Termination” on page 33, you must put a separate terminator on the
external connector of the HBA. Be sure to use the proper type of
terminator (LVD/SE for the A5150A).
Scenario Four
If peripheral devices are connected to the external connector via a
V-cable and the HBA is in the middle of the SCSI bus, you must
terminate the last device on the bus. In this configuration, auto
termination must be disabled on the HBA to prevent improper
termination of the bus.
Scenario Five
If the HBA is connected to another HBA in a multi-initiator or High
Availability configuration, you must disable the auto termination feature
as described in “How to Turn Off Auto Termination” on page 33.
Scenario Six