Compaq AA-RHGWB-TE manual

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 BA356 SCSI 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.

Termination for the BA356 single-ended bus is on the personality module, and is 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 personality module of one BA356 are set for SCSI IDs 0 through 7 and the switches on the personality module of the other BA356 are set for SCSI IDs 8 through 14.

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Do not install a narrow disk in a BA356 that is enabled for SCSI IDs 8 through 14. The SCSI bus will not operate correctly because the narrow disks cannot recognize wide addresses.

Like the BA350, you can set up the BA356 for two-bus operation by installing 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.

You can 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 for storing 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