Technical data

1.6 Eight-Member Clusters
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.
An eight-member cluster using Fibre Channel can be extrapolated easily
from the discussions in Chapter 6; just connect the systems and storage
to your fabric.
An eight-member cluster using shared SCSI storage is more complicated
than Fibre Channel, and requires considerable care to configure. One
way to configure an eight-member cluster using external termination is
discussed in Chapter 11.
1.7 Overview of Setting Up the TruCluster Server Hardware
Configuration
To set up a TruCluster Server hardware configuration, follow these steps:
1. Plan your hardware configuration. (See Chapter 3, Chapter 4,
Chapter 6, Chapter 9, Chapter 10, and Chapter 11.)
2. Draw a diagram of your configuration.
3. Compare your diagram with the examples in Chapter 3, Chapter 6,
Chapter 10, and Chapter 11.
4. Identify all devices, cables, SCSI adapters, and so forth. Use the
diagram that you just constructed.
5. Prepare the shared storage by installing disks and configuring any RAID
controller subsystems. (See Chapter 3, Chapter 6, and Chapter 10 and
the documentation for the StorageWorks enclosure or RAID controller.)
6. Install signal converters in the StorageWorks enclosures, if applicable.
(See Chapter 3 and Chapter 10.)
7. Connect storage to the shared SCSI buses. Terminate each bus. Use
Y cables or trilink connectors where necessary. (See Chapter 3 and
Chapter 10.)
1–20 Introduction