interconnect, you can more easily alter or expand your cluster’s hardware configuration as newer and faster technologies become available.

1.2Overview of the TruCluster Server Hardware Configuration

A TruCluster Server hardware configuration consists of a number of highly specific hardware components:

TruCluster Server currently supports from one to eight 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 SCSI bus. 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).

You need 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 directly or 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 TruCluster Server, 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

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Compaq AA-RHGWB-TE manual Overview of the TruCluster Server Hardware Configuration