Compaq AA-RHGWC-TE manual

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.

3.7.1.1Preparing 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.

3–18Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware