Technical data

see their non-active host ports as passive. If one of the controllers fails, the
surviving controller sees both host ports as active.
In the active/passive mode, the primary controller sees both host ports as
active. The other controller sees both host ports as passive. If the primary
controller fails, the remaining controller takes over and sees both host
ports as active.
The following sections describe how to cable the HSZ70, HSZ80, or RA3000
for TruCluster Server configurations using an UltraSCSI hub. See Chapter 9
and Chapter 10 for information on configurations using external termination.
See Chapter 6 for information regarding Fibre Channel storage.
3.7.1.1 Preparing an HSZ70 or HSZ80 for a Shared SCSI Bus Using Transparent
Failover Mode
When using transparent failover mode:
• Both controllers of an HSZ70 are connected to the same shared SCSI bus
• For an HSZ80:
– Port 1 of controller A and Port 1 of controller B are on the same
SCSI bus.
– If used, Port 2 of controller A and Port 2 of controller B are on the
same SCSI bus.
– HSZ80 targets assigned to Port 1 cannot be seen by Port 2.
To cable a dual-redundant HSZ70 or HSZ80 for transparent failover in a
TruCluster Server configuration using a DS-DWZZH-03 or DS-DWZZH-05
UltraSCSI hub, see Figure 3–5 (HSZ70) or Figure 3–6 (HSZ80) and follow
these steps:
1. You will need two H8861-AA VHDCI trilink connectors. Install an
H8863-AA VHDCI 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 H8861-AA VHDCI
trilink connector to:
• HSZ70 controller A and controller B
• HSZ80 Port 1 (2) of controller A and Port 1 (2) of controller B
___________________ Note ___________________
You must use the same port on each HSZ80 controller.
3. Install a BN37A cable between the trilinks on:
Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware 3–19