Compaq AA-RHGWB-TE manual 1 BA350 Storage Shelf

9.3.1 BA350 Storage Shelf

Up to seven narrow (8-bit) single-ended StorageWorks building blocks (SBBs) can be installed in the BA350. Their SCSI IDs are based upon the slot they are installed in. For instance, a disk installed in BA350 slot 0 has SCSI ID 0, a disk installed in BA350 slot 1 has SCSI ID 1, and so forth.

______________________ Note _______________________

Do not install disks in the slots corresponding to the host SCSI

IDs (usually SCSI ID 6 and 7 for a two-node cluster).

You use a DWZZA-VA as the interface between the wide, differential shared SCSI bus and the BA350 narrow, single-ended SCSI bus segment.

______________________ Note _______________________

Do not use a DWZZB-VW in a BA350. The use of the wide DWZZB-VW on the narrow single-ended bus will result in unterminated data lines in the DWZZB-VW, which will cause SCSI bus errors.

The BA350 storage shelf contains internal SCSI bus termination and a SCSI bus jumper. The jumper is not removed during normal operation.

The BA350 can be set up for two-bus operation, but that option is not very useful for a shared SCSI bus and is not covered in this manual.

Figure 9–6 shows the relative locations of the BA350 SCSI bus terminator and SCSI bus jumper. They are accessed from the rear of the box. For operation within a TruCluster Server cluster, both the J jumper and T terminator must be installed.

Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices 9–9