interconnect, you can more easily alter or expand your cluster’s hardware
configuration as newer and faster technologies become available.
1.2 Overview of the TruCluster Server Hardware
Configuration
A TruClusterServer hardware configuration consists of a number of highly
specific hardware components:
•TruClusterServer currently supports from one toeight member systems.
•There must be sufficient internal and external SCSI controllers, Fibre
Channel host bus adapters, and disks to provide sufficient storage for
the applications.
•The clusterwide root (/), /usr, and /var file systems should be on
a shared SCSI bus. We recommend placing all member system boot
disks on a shared SCSIbus. If you have a quorum disk, it must be on
a shared SCSI bus.
_____________________ Note _____________________
The clusterwide root (/), /usr, and /var file systems, the
member system boot disks, and the quorum disk may be
located behind a RAID array controller, including the HSG80
controller (Fibre Channel).
•Youneed to allocate a number of Internet Protocol (IP) addresses from
one IP subnet to allow client access to the cluster. The IP subnet has
to be visible to the clients directlyor through routers. The miminum
number of allocated addresses is equal to the number of cluster member
systems plus one (for the cluster alias), depending on the type of cluster
alias configuration.
For client access, TruCluster Server allows you to configure any number
of monitored network adapters (using a redundant array of independent
network adapters (NetRAIN) and Network Interface Failure Finder
(NIFF) facilities of the Tru64 UNIX operating system).
•TruCluster Server requires at least one peripheral component
interconnect (PCI) Memory Channel adapter on each system. The
Memory Channel adapters comprise the cluster interconnect for
TruClusterServer, providing host-to-host communications. For a cluster
with two systems, a Memory Channel hub is optional; the Memory
Channel adapters can be connected with a cable.
If there are more than two systems in the cluster, a Memory Channel
hub is required. The Memory Channel hub is a PC-class enclosure that
1–2Introduction