select SCSI IDs 0 through 6, set the personality module address switches 1
through 7 to off. To select SCSI IDs 8 through 14, set personality module
address switches 1 through 3 to on and switches 4 through 7 to off.
Figure 9–7 shows the relative location of the BA356SCSI bus jumper,
BA35X-MF.The jumper is accessed from the rear of the box. For operation
within a TruCluster Server cluster, you must install the J jumper in the
normal position, behind slot 6. Note that the SCSI bus jumper is not in the
same position in the BA356 as in the BA350.
Terminationfor the BA356 single-ended bus is on the personality module,
andis active unless a cable is installed on JB1 to daisy chain the single-ended
SCSI bus in two BA356 storage shelves together. In this case, when the
cable is connected to JB1, the personality module terminator is disabled.
Daisy chaining the single-ended bus between two BA356s is not used in
clusters. We use DWZZB-VWs (with an attached H885-AA trilink connector)
in each BA356 to connect the wide-differential connection from the host
adapters to both BA356s in parallel. The switches on the personalitymodule
of one BA356 are set for SCSI IDs 0 through 7 and the switches on the
personality module of the other BA356 are setfor SCSI IDs 8 through 14.
______________________ Note _______________________
Do not install a narrow disk in a BA356 that is enabled for SCSI
IDs 8 through14. The SCSI bus will not operate correctly because
the narrow disks cannot recognize wide addresses.
Likethe BA350, youcan set up theBA356 for two-bus operation byinstalling
a SCSI bus terminator (BA35X-ME) in place of the SCSI bus jumper.
However,like the BA350, two-bus operation in the BA356 is not very useful
for a TruCluster Server cluster.
Youcan use the position behind slot 1 in the BA356 to store the SCSI bus
terminator or jumper.
Figure 9–7 shows the relative locations of the BA356 SCSI bus jumper and
the position forstoring the SCSI bus jumper, if you do install the terminator.
For operation within a TruCluster Server cluster, you must install the J
jumper.
Configurations Using External Termination or Radial Connections to
Non-UltraSCSI Devices 9–11