Multi-Adapter Configurations
There are configurations that use more than one SCSI adapter on any single SCSI
bus. In these cases the automatic termination sensing logic must be overridden by
setting the individual jumpers S1, S2, S3 and S4 located on jumper block J7.
The automatic sensing logic, which controls the enablement or disablement of the
built on terminators, works by detecting an external terminator on the external SCSI
bus, or by detecting an internal terminator on the internal SCSI bus. This control
logic can not sense the built-in adapter terminators of another adapter on the SCSI
bus. Therefore, in these cases, you must specify to the adapters that external
cabling is in use by moving the jumpers on J7.
These configurations also require that you change the default SCSI address of
additional adapters to something other than 7. All devices and adapters that share a
SCSI bus must have a unique SCSI ID. The default SCSI address setting on the
adapter is modified by software. Refer to the software documentation for the
operating system and device driver you are using to determine how to do this.
Typical Multi-Adapter Configurations
Two system unit systems sharing internal devices located on only one of the system
unit systems.
Appendix C. Jumper Settings and Multi-Adapter Configurations
C-5
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