Technical data

2.5
RAID Array Controller Restrictions .. .............................
2–10
2.6
SCSI Signal Converters ..............................................
2–12
2.7
DS-DWZZH-03 and DS-DWZZH-05 UltraSCSI Hubs .. ..... .... 2–13
2.8
SCSI Cables ............................................................
2–14
2.9
SCSI Terminators and Trilink Connectors . .... ................... 2–16
3 Shared SCSI Bus Requirements and Configurations Using
UltraSCSI Hardware
3.1
Shared SCSI Bus Configuration Requirements . ................. 3–2
3.2
SCSI Bus Performance ...............................................
3–4
3.2.1
SCSI Bus Versus SCSI Bus Segments .... .... ................ 3–4
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 .. ..... ................. 3–6
3.4
SCSI Bus Length .. .... ................................................
3–7
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 . . ... ................................................
3–9
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 .... ..... . 3–11
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 . ..... ... . 3–16
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 . .... ... ................ 3–19
3.7.1.2
Preparing a Dual-Redundant HSZ70 or HSZ80 for a
Shared SCSI Bus Using Multiple-Bus Failover ..... ... 3–23
3.7.1.3
Preparing an RA3000 for Use on a Shared SCSI Bus
with an UltraSCSI Hub ... .... ............................. 3–26
iv Contents