Compaq TruCluster Server AA-RHGWB-TE, Manual

Page: 259 / 320

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