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2.6
SCSI Signal Converters ..............................................
2–10
2.7
DS-DWZZH-03 and DS-DWZZH-05 UltraSCSI Hubs ........... 2–11
2.8
SCSI Cables ............................................................
2–12
2.9
SCSI Terminators and Trilink Connectors ........................ 2–14
3 Shared SCSI Bus Requirements and Configurations Using
UltraSCSI Hardware
3.1
Shared SCSI Bus Configuration Requirements .................. 3–2
3.2
SCSI Bus Performance ...............................................
3–3
3.2.1
SCSI Bus Versus SCSI Bus Segments ........................ 3–3
3.2.2
Transmission Methods .......................................... 3–4
3.2.3
Data Path .........................................................
3–5
3.2.4
Bus Speed .........................................................
3–5
3.3
SCSI Bus Device Identification Numbers ........................ 3–5
3.4
SCSI Bus Length ......................................................
3–6
3.5
Terminating the Shared SCSI Bus When Using UltraSCSI
Hubs ....................................................................
3–7
3.6
UltraSCSI Hubs .......................................................
3–8
3.6.1
Using a DWZZH UltraSCSI Hub in a Cluster
Configuration .....................................................
3–8
3.6.1.1
DS-DWZZH-03 Description ................................ 3–9
3.6.1.2
DS-DWZZH-05 Description ................................ 3–10
3.6.1.2.1
DS-DWZZH-05 Configuration Guidelines .......... 3–10
3.6.1.2.2
DS-DWZZH-05 Fair Arbitration ..................... 3–12
3.6.1.2.3
DS-DWZZH-05 Address Configurations ............ 3–13
3.6.1.2.4
SCSI Bus Termination Power ......................... 3–15
3.6.1.2.5
DS-DWZZH-05 Indicators ............................. 3–15
3.6.1.3
Installing the DS-DWZZH-05 UltraSCSI Hub .......... 3–15
3.7
Preparing the UltraSCSI Storage Configuration ................ 3–16
3.7.1
Configuring Radially Connected TruCluster Server
Clusters with UltraSCSI Hardware ........................... 3–17
3.7.1.1
Preparing an HSZ70 or HSZ80 for a Shared SCSI Bus
Using Transparent Failover Mode ........................ 3–18
3.7.1.2
Preparing a Dual-Redundant HSZ70 or HSZ80 for a
Shared SCSI Bus Using Multiple-Bus Failover ........ 3–22
4 TruCluster Server System Configuration Using UltraSCSI
Hardware
4.1
Planning Your TruCluster Server Hardware Configuration ... 4–2
4.2
Obtaining the Firmware Release Notes ........................... 4–4
4.3
TruCluster Server Hardware Installation ........................ 4–5
iv Contents