Technical data

Configuring an Eight-Member Cluster

Using Externally Terminated Shared SCSI

Buses

This chapter discusses the following topics:

• Overview of an eight-node cluster (Section 11.1)

• How to configure an eight-node cluster using an UltraSCSI BA356 and

external termination (Section 11.2)

TruCluster Server Version 5.1A supports eight-member cluster

configurations as follows:

• Fibre Channel: Eight-member systems may be connected to common

storage over Fibre Channel in a fabric (switch) configuration.

• Parallel SCSI: Only four of the member systems may be connected to

any one SCSI bus, but you can have multiple SCSI buses connected to

different sets of nodes, and the sets of nodes may overlap. We recommend

you use a DS-DWZZH-05 UltraSCSI hub with fair arbitration enabled

when connecting four-member systems to a common SCSI bus using

RAID array controllers.

_____________________ Note _____________________

The DS-DWZZH-03/05 UltraSCSI hubs cannot be connected

to a StorageWorks BA35X storage shelf because the storage

shelf does not provide termination power to the hub.

Configuring an eight-member cluster using Fibre Channel is straightforward;

connect the member systems to the Memory Channel hub and to the Fibre

Channel switches. (See Chapter 6 for more information on configuring

Fibre Channel).

Configuring an eight-member cluster using shared SCSI buses is more

complex because you can only have four member systems on a single shared

SCSI bus.

Configuring an Eight-Member Cluster Using Externally Terminated

Shared SCSI Buses 11–1