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or SCSI bus failure, the host can redistribute the load to the surviving
controller. In case of a controller failure, the surviving controller will handle
all units.
______________________ Notes ______________________
Multiple-bus failover does not support device partitioning with
the HSZ70 or HSZ80.
Partioned storagesets and partitioned single-disk units cannot
function in multiple-bus failover dual-redundant configurations.
Because they are not supported, you must delete your partitions
before configuring the HSZ70 or HSZ80 controllers for
multiple-bus failover.
Device partitioning is supported with HSG60 and HSG80 array
controllers with ACS Version 8.5.
Multiple-bus failover does not support tape drives or CD-ROM
drives.
The following sections describe how to cable the HSZ70 or HSZ80 for
TruCluster Server configurations. 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.
3–18 Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware