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3
Shared SCSI Bus Requirements and
Configurations Using UltraSCSI Hardware
A TruCluster Server cluster uses shared SCSI buses, external storage
shelves or RAID controllers, and supports disk mirroring and fast file system
recovery to provide high data availability and reliability.
This chapter:
• Introduces SCSI bus configuration concepts
• Describes requirements for the shared SCSI bus
• Provides procedures for cabling TruCluster Server radial configurations
using UltraSCSI hubs and:
– Dual-redundant HSZ70 or HSZ80 RAID array controllers enabled
for simultaneous failover
– Dual-redundant HSZ70 or HSZ80 RAID array controllers enabled
for multiple-bus failover
• Provides diagrams of TruCluster Server storage configurations using
UltraSCSI hardware configured for radial connections
______________________ Note _______________________
Although the UltraSCSI BA356 might have been included in
this chapter with the other UltraSCSI devices, it is not. The
UltraSCSI BA356 is covered in Chapter 9 with the configurations
using external termination. It cannot be cabled directly to an
UltraSCSI hub because it does not provide SCSI bus termination
power (termpwr).
In addition to using only supported hardware, adhering to the requirements
described in this chapter will ensure that your cluster operates correctly.
Chapter 9 contains additional information about using SCSI bus signal
converters, and also contains diagrams of TruCluster Server configurations
using UltraSCSI and non-UltraSCSI storage shelves and RAID array
controllers. The chapter also covers the older method of using external
termination and covers radial configurations with the DWZZH UltraSCSI
hubs and non-UltraSCSI RAID array controllers.
Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware 3–1