User`s guide

The following sections describe how to install and configure the hardware
for a TruCluster Production Server Software or TruCluster Available
Server Software configuration that includes the StorageWorks RAID Array
3000 subsystem.
2.2 Installing and Configuring a TruCluster Configuration
with a StorageWorks RAID Array 3000
This section provides details on how to install and configure the hardware
to support the StorageWorks RAID Array 3000 (RA3000) in a TruCluster
configuration.
The qualification and use of the DS-DWZZH-series UltraSCSI hubs in
TruCluster configurations allows the cluster to be cabled in two different
ways:
• Preferred method with radial connection to a DWZZH UltraSCSI hub
and internal termination: The KZPBA-CB internal termination resistor
SIPs are not removed. The host adapters are connected directly to a
DWZZH UltraSCSI hub port. There can be only one member system or
controller port connected to each hub port.
The use of a DWZZH UltraSCSI hub in a TruCluster configuration is
preferred because it:
– Improves the reliability of the detection of cable faults
– Provides for automatic termination of the UltraSCSI bus upon a
fault or cable removal
– Is easier to cable the configuration, and therefore less prone to
human error
• Old method with external termination: Shared SCSI bus termination is
external to the KZPBA-CB UltraSCSI host adapter. This is the old
method used to connect a PCI SCSI adapter to the cluster; remove the
adapter termination resistor SIPs and install a BN21W-0B Y cable and
an H879-AA terminator for external termination. This allows the
removal of a SCSI bus cable from the host adapter without affecting
SCSI bus termination.
This method may be used with or without a DWZZH UltraSCSI hub
with the following restrictions:
– You may use external termination and Y cables with a DWZZH-03
UltraSCSI hub to achieve a 4-member cluster configuration.
– You may not use external termination and Y cables with a
DWZZH-05 UltraSCSI hub.
Follow the steps in Table 2–1 to start the procedure to configure the
hardware for a TruCluster Production Server or TruCluster Available
Using the StorageWorks RAID Array 3000 in a TruCluster Configuration 2–3