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9
Configurations Using External
Termination or Radial Connections
to Non-UltraSCSI Devices
This chapter describes the requirements for the shared SCSI bus using:
• Externally terminated TruCluster Server configurations
• Radial configurations with non-UltraSCSI RAID array controllers
In addition to using only the supported hardware, adhering to the
requirements described in this chapter will ensure that your cluster operates
correctly.
This chapter discusses the following topics:
• Using SCSI bus signal converters (Section 9.1)
• SCSI bus termination in externally terminated TruCluster Server
configurations (Section 9.2)
• Overview of the BA350, BA356, and UltraSCSI BA356 disk storage
shelves (Section 9.3)
• Preparing the storage configuration for external termination using Y
cables and trilinks (Section 9.4)
– Preparing the storage shelves for an externally terminated
TruCluster Server configuration (Section 9.4.1)
– Connecting multiple storage shelves, for instance a BA350 and a
BA356, two BA356s, or two UltraSCSI BA356s (Section 9.4.2)
– Using the HSZ20, HSZ40, or HSZ50 RAID array controllers
(Section 9.4.3)
• Radial configurations using the HSZ40 or HSZ50 RAID array controllers
(Section 9.4.4)
Introductory information covering SCSI bus configuration concepts (SCSI
bus speed, data path, and so on) and SCSI bus configuration requirements
can be found in Chapter 3.
Configurations Using External Termination or Radial Connections to
Non-UltraSCSI Devices 9–1