Compaq AA-RHGWB-TE manual

9.4.3.1 Cabling an HSZ40 or HSZ50 in a Cluster Using External Termination

To connect an HSZ40 or HSZ50 controller to an externally terminated shared SCSI bus, follow these steps:

1.If the HSZ40 or HSZ50 will be on the end of the shared SCSI bus, attach an H879-AA terminator to an H885-AA trilink connector.

2.Attach an H885-AA trilink connector to each RAID controller port. Attach the H885-AA trilink connector with the terminator to the controller that will be on the end of the shared SCSI bus.

3.If you are using dual-redundant RAID array controllers, install a BN21-K or BN21L cable (a BN21L-0B is a 0.15-meter cable) between the H885-AA trilink connectors on the controllers.

4.When the host bus adapters (KZPSA-BB or KZPBA-CB) have been installed, connect the host bus adapters and RAID array controllers together with BN21K or BN21L cables as follows:

•Both member systems are on the ends of the bus: Attach a BN21K or BN21L cable from the BN21W-0B Y cable on each host bus adapter to the RAID array controller(s).

•RAID array controller is on the end of the bus: Connect a BN21K (or BN21L) cable from the BN21W-0B Y cable on one host bus adapter to the BN21W-0B Y cable on the other host bus adapter. Attach another BN21K (or BN21L) cable from the open BN21W-0B Y cable connector to the open H885-AA connector on the RAID array controller.

Figure 9–12 shows two AlphaServer systems in a TruCluster Server configuration with dual-redundant HSZ50 RAID controllers in the middle of the shared SCSI bus. Note that the SCSI bus adapters are KZPSA-BB PCI-to-SCSI adapters. They could be KZPBA-CB host bus adapters without changing any cables.

Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices 9–25