OpenVMS Cluster Systems - OpenVMS Systems - HP

OpenVMS Cluster Interconnect Configurations
3.3 OpenVMS Cluster Systems Interconnected by DSSI
References: Some restrictions apply to the type of CPUs and DSSI I/O adapters
that can reside on the same DSSI bus. Consult your service representative or see
the OpenVMS Cluster Software Software Product Description (SPD) for complete
and up-to-date configuration details about DSSI OpenVMS Cluster systems.
3.3.4 Example
Figure 3–2 shows a typical DSSI configuration.
Figure 3–2 DSSI OpenVMS Cluster Configuration
RF Disks
DSSI
Alpha or VAX Alpha or VAX Alpha or VAX
ZK−5944A−GE
3.4 OpenVMS Cluster Systems Interconnected by LANs
The Ethernet (10/100 and Gigabit), FDDI, and ATM interconnects are industrystandard
local area networks (LANs) that are generally shared by a wide variety
of network consumers. When OpenVMS Cluster systems are based on LAN,
cluster communications are carried out by a port driver (PEDRIVER) that
emulates CI port functions.
3.4.1 Design
The OpenVMS Cluster software is designed to use the Ethernet, ATM, and FDDI
ports and interconnects simultaneously with the DECnet, TCP/IP, and SCS
protocols. This is accomplished by allowing LAN data link software to control the
hardware port. This software provides a multiplexing function so that the cluster
protocols are simply another user of a shared hardware resource. See Figure 2–1
for an illustration of this concept.
3.4.2 Cluster Group Numbers and Cluster Passwords
A single LAN can support multiple LAN-based OpenVMS Cluster systems. Each
OpenVMS Cluster is identified and secured by a unique cluster group number
and a cluster password. Chapter 2 describes cluster group numbers and cluster
passwords in detail.
3–4 OpenVMS Cluster Interconnect Configurations