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