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Table 10–6: Hardware Components Used in the Configuration Shown in
Figure 10–17
Callout Number
Description
1
H879-AA terminator
2
BN21W-0B Y cable
3
BN38C HD68 to VHDCI cable
a
4
BN37A-0E 50-centimeter (19.7-inch) VHDCI cable
a
a
The maximum length of the SCSI bus segment, including the combined length of BN38C (or
BN38E-0B/BN37A combination), BN37A-0E, and any BN21K (BN21L or BN31G) cables that might be
connecting adjacent systems (which are not shown in the figure) and internal device length, must not exceed
25 meters (82 feet).
10.5 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 want 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.
2. Attach the trilink with the terminator to the controller that you want
to be on the end of the shared SCSI bus. Attach an H885-AA trilink
connector to the other controller.
3. Install a BN21K or BN21L cable between the H885-AA trilink
connectors on the two controllers. The BN21L-0B is a 15-centimeter
(5.9-inch) cable.
4. If you are using a DS-DWZZH-05:
• Verify that the fair arbitration switch is in the
Fair position to
enable fair arbitration (see Section 3.6.1.2.2)
• Ensure that the W1 jumper is removed to select wide addressing
mode (see Section 3.6.1.2.3)
5. Install the UltraSCSI hub in:
• A StorageWorks UltraSCSI BA356 shelf (which has the required
180-watt power supply).
• A non-UltraSCSI BA356 that has been upgraded to the 180-watt
power supply with the DS-BA35X-HH option.
10–34 Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices