Compaq AA-RHGWC-TE manual Cabling an HSZ20 in a Cluster Using External Termination

9.4.3.2 Cabling an HSZ20 in a Cluster Using External Termination

To connect a SWXRA-Z1 (HSZ20 controller) to a shared SCSI bus, follow these steps:

1.Referring to the RAID Array 310 Deskside Subsystem (SWXRA-ZX) Hardware User’s Guide, open the SWXRA-Z1 cabinet, locate the SCSI bus converter board, and:

•Remove the five differential terminator resistor SIPs.

•Ensure that the W1 and W2 jumpers are installed to enable the single-ended termination on one end of the bus.

___________________ Note ___________________

The RAID Array 310 SCSI bus converter board is the same logic board used in the DWZZB signal converter.

2.Attach an H885-AA trilink connector to the SCSI input connector (on the back of the cabinet).

3.Use a BN21K or BN21L cable to connect the trilink connector to a trilink connector or BN21W-0B Y cable attached to a differential SCSI controller, another storage shelf, or the differential end of a signal converter.

4.Terminate the differential bus by attaching an H879-AA terminator to the H885-AA trilink connector or BN21W-0B Y cable at each end of the shared SCSI bus.

Ensure that all devices that make up the shared SCSI bus are connected, and that there is a terminator at each end of the shared SCSI bus.

9.4.4Cabling an HSZ40 or HSZ50 RAID Array Controller in a Radial Configuration with an UltraSCSI Hub

You may have an HSZ40 or HSZ50 that you wish to keep when you upgrade to a newer AlphaServer system. You can connect an HSZ40 or HSZ50 to an UltraSCSI hub in a radial configuration, but even if the host bus adapter is a KZPBA-CB, it will not operate at UltraSCSI speed with the HSZ40 or HSZ50.

To configure a dual-redundant HSZ40 or HSZ50 RAID array controller and an UltraSCSI hub in a radial configuration, follow these steps:

1.You will need two H885-AA trilink connectors. Install an H879-AA terminator on one of the trilinks.

9–28Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices