Compaq manual Installing the DS-DWZZH-05 UltraSCSI Hub

To configure a TruCluster configuration using a DS-DWZZH-05 UltraSCSI hub, follow these steps:

1.Configure and install the DS-DWZZH-05 UltraSCSI hub (Section 2.7.1)

2.Verify that the host adapter termination is installed and cable the host adapter to the DS-DWZZH-05 UltraSCSI hub (Section 2.7.2)

3.Cable the RAID array controller to the hub:

·HSZ50 (Section 2.7.3.1)

·HSZ70 (Section 2.7.3.2)

2.7.1Installing the DS-DWZZH-05 UltraSCSI Hub

All existing versions of Compaq's DIGITAL UNIX operating systems support only eight devices on a SCSI bus. Therefore, narrow addressing mode must be used.

Install the DS-DWZZH-05 UltraSCSI hub as follows:

1.Install the W1 jumper to enable narrow addressing mode (see Figure 2–2).

2.If fair arbitration is to be used, ensure that the switch on the front of the DS-DWZZH-05 UltraSCSI hub is in the Fair position.

3.Install the DW-DWZZH-05 UltraSCSI hub in a DS-BA356, BA356 (if it has the required 180-watt power supply), or BA370 storage shelf.

2.7.2Checking the Host Adapter and Cabling it to the Hub

At the present time only the KZPSA-BB and KZPBA-CB host adpaters are supported for use with the DS-DWZZH-05 UltraSCSI hub in TruCluster configurations with an HSZ50 or HSZ70 RAID array controller.

See the TruCluster Software Products Hardware Configuration manual and Hardware Configuration Technical Update for DS-KZPBA-CBand verify the following:

·Ensure that the KZPSA-BB termination resistor SIPs (Z1 through Z5) or KZPBA-CB termination resistors (RM1 through RM8) are installed.

·If fair arbitration is selected on the DS-DWZZH-05 UltraSCSI hub, ensure that the host adapter SCSI ID matches the controller port SCSI ID on the DS-DWZZH-05 for the port that the adapter will be cabled to.

Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Configuration 2–7